Mercedes climate control fault codes and reset procedure C230

Mercedes single zone climate control trouble code readout,and reset procedure..Many Mercedes models used this same climate control panel...look closely to be sure yours is the same...dual zone climate controls have a different procedure and some specific codes..r129,w210,w124,w202,w140 and others, all can possibly have this panel as standard equipment depending on which country and what equipment level the car has..this car is a 1997 c230
FAULT CODES
DTC Readout Descriptions
026 CAN Bus Communication
226 In-Car Air Temperature Sensor
227 Outside Air Temperature Sensor
228 Heater Core Temperature Sensor
230 Evaporator Temperature Sensor
231 Engine Coolant Temperature Sensor
232 Refrigerant Pressure Sensor
233 Refrigerant Temperature Sensor
241 Refrigerant Level
416 Coolant Circulation Pump
417 Left Duovalve (Water Valve)
418 Right Duovalve (Water Valve)
419 A/C Compressor Electromagnetic Clutch
420 Closed (Idle) Throttle Speed Increase
421 Pulse Module
422 Serial Interface Connection (K1) to Instrument Cluster
451 Diverter Flap
452 Blend Air Flap
453 Fresh/Recirculated Air Flap Long Stroke
454 Fresh/Recirculated Air Flap Short Stroke
455 Defroster Outlet Flap Long Stroke
456 Defroster Outlet Flap Short Stroke
457 Footwell Flap Long Stroke
458 Footwell Flap Short Stroke
459 Serial Interface Connection (K2) to Instrument Cluster
462 Wide Open Throttle (WOT) Position Signal - Diesel Engine Only follow me on twitter / fupabox

[@wetsoup]

Can't thank you enough - A/C was just low, topped it off, cleared the codes and now it's freeeeeeezing ! Saved me a shop visit, not to mention the cost.

[@girl600podcast]

Just d/l this and went to your Twitter page. Thanks for all these old Benz vids. Years of help.

[@fupabox]

glad to help

[@davidhale5304]

I have just changed the battery on my 2000 C Class C220 CDI (w202) .The Climate Control started malfunctioning with fan running full speed with no apparent manual control, After following your excellent video and instructions "hey presto" now working perfectly. Thanks a lot for your help it is very much appreciated.

[@TestaFranco]

Im having this problem. How did this diagnostic help you fix the problem? Im just getting 416 code.

[@martinmeyer6669]

You W202 videos are great! Thanks for posting these. I live in California but all my cousins are Canadian and it always seems like one of them is narrating these videos. Thanks again!

[@andyc8480]

These vidoes are really great - I've a late 1999 CLK which is pretty much the same I believe and been watching a lot of your vids as I have a few interesting jobs coming up, managed to get into my climate control left low/right high ec + rest and confirmed the aux cooling pump has failed 416 after watching this video - many thanks for taking the time to upload them,

[@nicolasdiaz6839]

Your video is timeless thank you I just went through your video and looks like resetting has kicked my AC back on strange indeed thank you 🤙🏻

[@fupabox]

glad it helped

[@TonyAMG43]

Dude thank you. I replaced my A/C condenser and I knew something was wrong with the a/c system. thanks gain for this video!

[@amirkabirian9010]

This helped me to erase the codes before the compressor was engaged to recharge a 96 C280 A/C. The dealer wanted over $150 to erase the code. Thank you!

[@fupabox]

Amir Kabirian Very welcome...saving people money is what it's all about . .. glad it helped :)

[@lisamonetmakeup]

I feel like I'm doing everything right but the auto button is not flashing so it's not going into diagnostic mode I was just like to clear the codes my fan is working the clutch is engaged and put one can to recharge and I just know that I have to clear the codes and everything is going to work and I can't seem to do it

[@rob5628]

Great video. Worked on 1996 C220.

[@TheTaz069]

Found them!!!!!! Sorry for that!!!!! Well in that list of the 14 codes they were of the 14 things i fixed this past year.hehe. Thanks again!! Will be checking out your other vid's!!

[@merc95]

Thanks - very handy for my 2002 R129 SL500 !!!

[@SwimSherpaBayArea]

Dude, you totally fixed my a/c! Thanks!

[@fupabox]

very welcome :)

[@jayi836]

Thanks for posting this!

[@cesarbaez77]

Gracias!! me acabo de ahorrar una buena cantidad de dinero con este video!! Gracias

[@TheTaz069]

Bud I want to say THANKS A TON!!!! I found 14 pending codes. I cleared them as you explained. Now I just need to find that list!! I've had the car for a year and it has been my project car. Dang near got it restored, it's a 96 c280. New head,ac comp,water pump, radiator, alternator brushes,fuel pump, cross drilled rotors,ceramic pads,new tires, that's just for starters. Please ooooh please where can i get that list!!!!!

[@moriahthielemann5056]

Hi so I did what you talked about in the system and got codes: 241, 226, 416, 417, 419. I have not erased them yet. Will do now. Thanks for your help.

[@jimbrown8683]

Hi fupabox thanks for your comments I will look at the pump and post the results later or tomorrow

[@nanaimoclipper]

Thanks , good video

[@cambridgelive]

Thanks, working well with mine.

[@CharlesHeil-gk9kt]

The car is a 1996 C220 4 cyl. with 153000 miles and runs great. Between 25 and 30 mpg.

[@peterj754]

great vid, thanks...

[@alcawannamoore1370]

what's your advice of it's the A/C censor? I just got my compressor replaced, and it will blow out freezing air one minute but in 5 kind it'll stop. the mechanic said it will cost a grip to fix.

[@markvangemert8302]

Thanks once again for all of your great videos for the W202! Have you ever removed the climate control to change the backlight? I believe the two slots on the lower corners of the module are to accept a special tool correct?

[@fupabox]

correct...here is a video I made on how to make your own removal tool with an old credit card,,, same tool to remove the radio kzbin.info/www/bejne/e53TooGjfN50lbs

[@thaddeauscaldwell7101]

Great video. Would this process be the same for the 1997 SL320 R129 .

[@anthonymarrero4574]

your video are the absolute BEST!!!!! have you posted the list of codes and what they are for my electric fan on my 1998 c230 just went out. I'm hoping the code will tell me what is wrong or what part, unit, or module is malfunctioning. HELP!!!!

[@fupabox]

the codes are in the video description under the video .."show more " button right under the video

[@MZ69123]

Is there a way to read out the CEL codes without a scanner? Also where can I find the list of DTC for the 1997 C230? Ty again!

[@denisobrien7480]

I have a fault with the AC on my 1997 c class 280 the compressor engages for about 30 sec and blows very cold air then disengages clutch I know that the refrigerant charge is correct as Ihave evac system and charged with factor amount of 134a The two sensors on the receiver may be the problem I don't know, is there any way to short these out for testing purposes the only fault codes I had that came up were 22.7,23.2, 23.3 and the two that you also had come up 41.6 and 41.7 Cheers Denis

[@juniorvalerio8850]

Chidoooo🤘

[@amanbadshah2016]

Can u make video of how to change fahrenheit to celsius in mercedes clk 320 1999 plz and thank you

[@rioraton]

I am BACK :) hello there! 92 500sl so my aux fans do not come on with the air Off they do come on with the air on. any ideas on the problem ..relay or ballast resistor . I thought they should come on if no air and coolant gets hot?? how do those things work and when should they come on with out the air on? where is the ballast resistor located and the relay located and how do you test them...so many questions :) Thanks as always!

[@MZ69123]

Hope your winter is progressing well. I have had a slight coolant smell at idle at temperature for a while. Never when moving , no coolant leak anywhere to be seen, no moisture from HVAC sys. It does use coolant I have put in a gallon over 5 years and assume that there is a slight HG leak, but it runs fine. No smell or leak under the hood. I mean it can only be the heater core or lines but why would it not smell all the time? I did put in some stop leak a couple of years ago but didnt do much good. Any thoughts ? I would wait until summer to pull core as the car will be in my garage until snows gone.

[@fupabox]

+William Z I would think the heater core would leak a lot quicker since it is under pressure. But it could be the core.. Before going to that extreme, you could find a UV light and check under the hood once the car is running. The coolant should fluoresce under UV . A very tiny drip here and there can add up, and not be noticed especially under the hood. My first suspect would be the water pump seal at the bottom drip tube...they can leak slowly for years before they go completely

[@sweetiepie3722]

iS THERE A LIGHT BULB FOR THE RADIO CLUSTER? Brights aren't working. What could be the problem. Everything seems fine. Tom

[@TheBlueTurfdotcom]

Great video. I will try to make a long story short. I had a new compressor installed every thing was fine a couple days later the clutch snapped right off. I took it back to the location that installed it. They put a new compressor in however they claimed that my climate control system failed and the system was running just on ec. The compressor kicks on and off pretty quickly and from my gages appears to be slightly high side with presure. I ran your code and came up with collect levels and 451 as current then all the flap codes after that . Suggestions would be greatly appreciated.

[@fupabox]

the shop that installed the compressor should have evacuated and the then refilled the refrigerant. They made a mistake and it sounds like they are looking to blame someone...EC mode just turns the compressor off... I run my cars in EC mode 90% of the time...451 is the diverter flap and should also have nothing to do with the compressor ..it only opens/closes to redirect air,,,the flaps are all controlled by vacuum and the main vacuum block for them is under the glovebox by the interior air filter...look up in there for leaking or unhooked hoses

[@TheBlueTurfdotcom]

***** Thank you I've already got the blower motor out as it is and clearly that is not the issue. do you have any links to a dia for the 1996 c220? I have a feeling the leak was cause by a different shop doing other work.

[@TheBlueTurfdotcom]

***** as for the ac is it your opinion that the repair would be to have it properly evaded and refilled?

[@fupabox]

TheBlueTurfdotcom before any refrigerant containing component removed is from the a/c system, the system needs to be evacuated (it's actually illegal for them not to vacuum out the old refrigerant) then the faulty component gets replaced , the system refilled and pressure tested.. here is a good diagram of your a/c system components mbworld.org/forums/c-class-w203/393681-please-answer-ac-pressure.html

[@CarlosRiveraMuzik]

Would this work on a s class w140? my battery died and when i charged it. Nothing blows air?? I was told i needed to reset it or something. Please respond asap!

[@hey1292]

greets from poland and thanks for the video. i have a question. i got 231, 416, 417, 419. Do i just have to delete the codes or check all these things?

[@SkippyPB.]

Wish it can show OBDII codes. Btw, so you still own your R129s? Great videos. Just picked up my 2nd SL. It’s a 2000 year.

[@fupabox]

No ..I've gone through an SLK ,Porsche Boxter and currently a V8 Vantage roadster ..

[@jrtacuache7721]

Worked on an 97 SL600

[@2121cuervo]

ok take the two cans out and clean them or what?cause i think i have the same problem he got. i have a 99 mercedes benz c280 the ac been working fine for over a year but then i accidentally press the rest button and after that the a/c is mot cooling no more and is showing some codes.

[@fleetfighter]

I ran thru this and dlA appears then 'end'. Does this mean I have no error codes? ALso right after 'end' appears I get just about every code you listed above. Thanks again

[@vuittonwoods5048]

Okay I'll do it and see if it fixes it self

[@volandalorick3233]

I have a c280 and the temp hand is going up. I looked under the hood looking for the temp air senor and notice a small tan holes cut it was so hard the heat under the car could have cracked it. I replaced it and drive the car for about 15 mins and the temp hand stay at half point till I stopped and pulled over and it moved up. Then I notice the fan only worked when the AC was on and even then the hand still moved. what do you think could be the problem. I haven't tried anything else at the moment.

[@fupabox]

what year c280 ?

[@TheStiver]

Idk if this matters or not but maybe this can help someone else because I was having a hell of a time with it - if your a/c is already set to low when you start this procedure, set it up a few degrees and turn the car off and back on then start the procedure. Apparently the unit only will go into diagnostic mode within 20 seconds of changing the setting to Lo.

[@fupabox]

really ? excellent info .. thanks

[@TheStiver]

I found an official procedure online and it said "within 20 seconds of setting to low.." and it wasn't going for me until I did that. But apparently I picked up a stone on the highway not too long ago that popped a leak on my Chinese replacement condenser, I'm impressed the car detected a slight drop in pressure and locked out the compressor until I reset it (it still had enough to cool fairly well)... Then checked the pressures and added dye and the condenser was pretty obvious.. Long before ever running the system all the way down. And yes, I was trying to use a/c in January, it was in the low 70s*F today!!

[@fupabox]

The Stiver low 70s today.. damn -9 celcius here atm

[@TheStiver]

yeah we actually had a severe thunderstorm this afternoon. But winter is only a few days away for both of us! It'll get down around that -9*C here Thurs morning but you're looking at more like -20*C a couple nights from now. It was close to 90*F in most of Florida today and they're even getting in on the cold this week, could get into the 50s!!!

[@fleetfighter]

If you can do a video on what each of the buttons do that would be great. I get the auto, recirculate, defrost, and hi/lo, but what is EC and REST?

[@rjkulman8990]

EC puts your car in Economical Driving Mode, REST allow you to add heat after you shut the car off for x minutes

[@autopaint8399]

hi,I have a c class 220 cdi W202,with a manual ac,i want to convert it to automatic ac.can I change only the climate control unit or do I have to change something else,like the vents. thank you in advance

[@fupabox]

Honestly , I'm not sure what would be required .. I don't think they are compatible.. The auto would have the temp sensor overhead, the tie -in with the ECU to read battery drain and voltage , and possibly temp sensors in the venting

[@michaelkelley6376]

OK so I have a 2003 clk430. The climate control button to raise the fan speed hasn't worked for a year. Everything else worked fine. Today I take a drive turn on a/c by pushing the auto button. It never went above 2 bars. Then I decided to turn it off and try as gain. Now nothing works ( buttons) except the defrost buttons on climate control. Wth all the lcd lit up. Just non function buttons and it will be over a 104 in a few days and I have an all black car. Any Ideas. Or is the climate control just faulty?

[@fupabox]

it sounds like the unit itself is faulty...easy swap out if you can find a replacement

[@matthewcrawford1963]

Since you seem to be a bit of magician, I have a '99 E430 Avantgarde Auto. EC red light's been on for about a month. Had it re-gassed this morning - it was about one third full - but light still stays on and it won't blow cold air. Technician said the system was all fine, with no leaks, etc and it pressurised OK, but he didn't know the reset code. Sensor read-outs are below. 1. 30 2. 25 3. 31 4. 30 5. 26 6. 77 7. 06 8. 32 The only error code is: E. FF - which I think means No Errors, but not sure. After getting the E FF code, pressing the REST button would not exit out of TROUBLE CODE RETRIEVAL MODE setting without switching the car ignition off. I then tried pressing AUTO buttons simultaneously but this won't switch off EC light - so presumably not engaging the compressor. Also, the built-in light has failed and I can't see it to operate at night. Any ideas? Cheers, Matthew

[@fupabox]

After Noah your e430 has a dual zone system,, so the procedure is a bit different.. video here kzbin.info/www/bejne/l3_VnYRjp6h9oNk

[@hustleo28]

***** I have a 1994 c280 and I can't get the defrost vents to stop blowing hot air while the a.c. is on..can u help ?

[@fupabox]

hustleo28 sounds like a clogged or broken duovalve.. pretty easy to check and clean.. kzbin.info/www/bejne/bpvLgXicga5na9U

[@jyztwofifty5151]

my heaters./aircon are constantly blowing seems like on full fan power when i put the fuse in the fuse box, even when the key is out of the ignition.. ?? 1997 C200

[@fupabox]

check the blower regulator , it is likely the cause.. There is power to the fan even when the car is off (rest function ) and the regulator controls the negative feed to the fan .. if the regulator is bad it can constantly feed power to the fan motor. It's pretty cheap and easy to change. It is under the passenger side footwell above the passenger's knees. Once the cover is removed the regulator is the silver finned thing screwed to the fan housing.

[@lgr1172]

I have a Mercedes and the heater is not blowing hot. The air also only blows on defrost vents. It's a 98 c230. Also the AC was working then it stopped I tried charging it but its still dont get cold. Any info would help, thanks!

[@fupabox]

are any fault codes coming up ?

[@vuittonwoods5048]

Let me check again and see if that the code it's was ether that or 417 but I'm going to go check now

[@abdullahajlouni1816]

I have the same codes you had But is the duo valve that make the heater give a cold air ?

[@fupabox]

Yea . Generally it’s a failing duovalve or monovalve .

[@abdullahajlouni1816]

@@fupabox thank you soo much man

[@brentleygore6819]

Hello there! Thanks for this. I have c230 1998 and the unit comes on "High" and 80˚ every time I start the car, even after reset. Any thoughts ??

[@fupabox]

Brentley Gore It sounds like the resistor for the fan is going bad

[@brentleygore6819]

***** Anyway to know? Other than exchanging the resistor? It does work at every other temp not just on high. It just comes on 80 and HIGH Fan every time the battery goes from off to on (when starting). Also, If I replace resistor, is it under glove box and attached to fan? Thank you !!

[@fupabox]

Brentley Gore yes the resistor is under the glovebox...it does sound like the resistor is bad... not sure how to check the resistor..

[@per1co209]

How do i know what the codes mean

[@tomtom7955]

How do you figure out what the codes mean? My 2000 c280 gave me theses 41 degree 6 , 41 degree 7 and 41 degree 9. Any help would be greatly apreciated.

[@fupabox]

+Fenrir World-Eater (Tomtoms420) 416, 417, 419 in the video description...circulation pump, ac clutch and left duovalve

[@vuittonwoods5048]

Mines is blowing out hot air when I put the ax on and I got a 416 code

[@FizitTV]

How can I do this on a 05 C230? The w203 doesn't have the same button layout. Thank you.

[@fupabox]

I've read somewhere it has a similar procedure if it is the digital panel..not sure the exact procedure , sorry

[@tekere777]

Okay thanks!

[@jimbrown8683]

Hi I have a C220cdi and the A\C is blowing hot took it to a reputable company to have the system recharged but after the process the problem remain, there are no apparent leaks. I am not going to remove parts that would release the gasses into the Ozone but would like an indecator as to the cause. 7/7/15 Jim

[@fupabox]

Jim Brown reading the codes on the climate unit is the easiest way to diagnose the issue... a few other things to look at.. turn the a/c on (ec button off turns a/c on) and check to see if the a/c compressor on the front of the engine engages..the round outer part in front of the belt should engage and spin with the belt..if it doesn't usually the pressure switch/sensor is bad..or there are climate codes that need to be reset.. if the "ec" button remains lit up when pushed..the codes need to be reset

[@andrec7174]

in my 98 c280, the EC button turns on as soon as I start the air conditioner. if it's on it usually blows warm air. then I have to hold the button for about 15-20 seconds so the EC button will turn off. any ways to fix this??

[@fupabox]

it just means the system is getting low on coolant/freon/r134

[@matthewthompson1653]

Hello sir.i have a 99 s500 benz.just put in my climate control.the middle vent for ac/heat button dont lite up.can u help?😎

[@fupabox]

They are individual tiny LEDs built into the button . You would have to take the whole unit apart and solder in a new led chip

[@matthewthompson1653]

@@fupabox ok.thanks.

[@nicholesmith5161]

What do I do if my control panel only comes on if i press the rest button on my 2002 clk amg I just got my ac recharged and when I picked my car up the control panel wouldn't turn on

[@fupabox]

I would take it back to the place that recharged it and get them to fix it...check the climate control fuse first..it should be a different circuit than the "rest " circuit

[@Josephbrown9442]

Thank you for the amazing videos! I just had a question. My AC has never worked.. When I bought the car the seller said a mechanic quoted him $600 to fix it.. So today I pulled up the codes and man were there a lot.. There was only one current code.. 241 (low level).. Now for the pending codes, it gave me 231, 233, 416, 417, 419, 459, 451, 452, 455, 456, 457, and 458 lol.. Do you think it could be as easy as topping up the refrigerant? When I bought the car the blower motor wasn't working.. which I fixed right away, so that is probably where a lot of those codes are coming from.. Any words of advice would be greatly appreciated :) Thank you

[@fupabox]

low level could be the only issue...very often it is the reason A/C systems fail..the refrigerant being low will trip the pressure switch to not allow the compressor to come on...if you erase the codes and the only current one is 241..It would be simple and cheap to top it up and cross your fingers :) Without the old codes clearing the system won't operate properly. Pending codes are old ones not erased that the system thinks may occur again since they happened before, and may not be resolved since they are uncleared

[@Thedrifter1986]

I had the same error o my friend's w202 241 and EC light always on I erased the errors by your procedure The EC light turned off but the air isn cold in low position Why? My friend said to me the gas is full I hope you help me Byeee

[@memyself4ever1]

I have a 2002 e320 and my question is how do I turn the a/c on/off?

[@fupabox]

+memyself4ever1 the E/C button turns the compressor off

[@memyself4ever1]

***** So the E/C turns it off?

[@fupabox]

memyself4ever1 yes..e/c stands for economy mode..no compressor engagement when that button light is on..the compressor will still come on automatically if you push the front windshield defrost button..but in all other modes, e/c turns the compressor off

[@kamsythepoet8279]

fupabox how do I turn off my ac

[@agbella2954]

thanks alot , I have a 220 cdi and same fault code 416 and 419 and ESP doesn't work anymore I don't know why ??

[@fupabox]

+abdellatif gbella 416 is coolant recirc pump... after the car has been driven for a while press the "rest" button on the climate control panel when the car is turned off and see if you get warm air continuing to come from the vents for the next 10 minutes. If the air is still warm ( you will also hear a click every few seconds while it is in "rest" mode.) then the recirc pump is good. Does your air conditioning work ? 419 is usually caused by an aircon system needing re-gassing. The ESP could be a whole lot of things.. Does ABS work ? Does cruise control work ?

[@agbella2954]

+fupabox Thanks very much .1 yes my air conditioning work there's no cruise control in my car . is euro model .

[@agbella2954]

+abdellatif gbella I forgot the BAS ESP & ABS lights are always stays on after start the engine

[@fupabox]

abdellatif gbella The most likely cause for the BAS ABS ESP problem is the brake switch,,, a $30 10 minute repair... kzbin.info/www/bejne/gaXcmIN9fciJbLs

[@niacaligurl25]

I keep getting codes 421 and 459. I was able to locate the pulse module but I have no idea what or where the serial interface connection k2 to instrument cluster is. Please help.

[@fupabox]

niacaligurl25 K2 is just one of the plugs that goes from the gauge cluster to the hvac unit...it is needed to supply iformation to the hvac..outside temp, vehicle speed, coolant temperature etc.. check the connectors on the back of the gauge cluster and the hvac unit..if they are loose this code will show up

[@Kung_Fu_Frankie]

Can't thank you enough. EC mode was always on and the unit wasn't working. Even after I refilled it. Guess the mechanic never reset the system. Just deleted the codes and bam. I'm freezing. In a good way. You take donations?

[@fupabox]

Franklin Garrett lol...no donations.. glad it helped :)

[@postalgreetingcards]

I had to replace the climate control module on my 1999 R129 and someone walked me through the programing sequence, it took about 5 seconds. The module fits other Mercedes so you have to tell it which car its in or it may not work. Do you have that programming code sequence?

[@Bangouaman]

How do you get rid of the EC light being on?

[@fupabox]

You should be able to push the button and it goes out . If it stays lit the system is low on freon

[@MZ69123]

Hi There. My climate control system starts up on 72 full fan non auto whenever I start the car. Res doesnt seem to work. I tried unhooking it and the reset procedure here and code 421 comes up. Any thoughts? Ty as usual!

[@fupabox]

same issue as DJBRAINBUZZ had a few weeks ago (see comments and links below) the pulse modulator on the aux fan is either faulty or the wires are corroding...it counts the revolutions of the aux. cooling fan motor to make sure it is adequately turning to cool off the condenser ...when it isn't getting a proper signal it defaults to 72 degrees and fan on to prevent engine overheating damage...it's kinda overkill, and something only the Germans would think of...the links will show you how to find it under the fender well

[@MZ69123]

***** Thats a nice link for sure! Is there supposed to be two fans mine only has one and it has the dumbass headlight washers that may be covering up the position of the relay. I cant find it so far is there another place they might have put it? Ty as always!

[@MZ69123]

I found it it was underneath the wheel well front cover. Connections look good I wonder if theres any way to test it or put it on the CT boneyard list!

[@MZ69123]

THere are screws on the back and of course one wouldnt budge. I will probably drill it out and see if there is anything that can be repaired in it .There is one on Ebay and it says that its for SLK not C230 but its there

[@fupabox]

William Z not sure how to test one or tell if it is bad...I would guess that if the hvac comp. says it isn't getting the signal there must be something wrong... I have yet to have the self diagnosis components on any Mercedes give me a wrong answer...that's why there are usually more than 1 code..since one failed sensor can cause another to have a false reading , the codes will come up for both as possibilities ...I have found more often that not that older electronic components with a circuit board can be repaired by re-tinning (melting the solder joints and allowing them to re-form) and de-whiskering the board...it has been found that since the demise of lead in solder, there is a tendency for solder joints to form microscopic "whiskers" or tendrils that grow out and make contact with nearby circuits...as long as there is no power to the circuit board it can be cleaned of tendrils with a soft plastic brush (gently brush the circuit board and blow it off with compressed air) www.empf.org/empfasis/2009/may09/tin.html

[@CharlesHeil-gk9kt]

I get to the code dEL and I can delete that but I also get code dl A and I cant delete it. Both separate or one before the other or vise-vesa. I get no air coming out of the two center vents. Help

[@fupabox]

Charles Heil Dla isn't a code, It is used to list codes that are non current, so any code (numerical) that appears after dla is a current code...dla on the panel with no numbers following ,means there are no codes..DEL is just showing that it is now ready to delete any codes if they are present...have you done an air vent flap test ? kzbin.info/www/bejne/ZmaVl2OGeL2inrM

[@MitchellGordon]

How do you shut off the Climate Control A/C On A 1996 Mercedes Benz S500? I like driving with my windows open, but, I can't seem to shut the air off....***PLEASE HELP**

[@fupabox]

press the - fan speed button until the whole unit shuts off ? or is the fan staying on even when shut off ?

[@donjohnson4368]

Guys I’m getting a “ d 1A “ on the screen but I can’t see that code on the list

[@casadeculturaastudentilord4515]

Help me guys ... ( C200 kompressor W202 , single zone climate ) Once I have deleted 4 maybe 5 fault codes , I can not insert the ignition key , even less to twist More than that , the problems have not being solved : the Rest function is starting without touching any button after 1 minute from stopping the engine and all the orange lamps starts to blinking after using the central locking - I don't know how to say in English to the damage button Edit : it's working now , the key was recognized after 2 minutes

[@fupabox]

wow that's weird...I have never seen that before...I'm glad it is working for you now

[@TiktokBrandoniMacaroni]

my 2008 Cadillac CTS4 temp gauges for both driver and passenger have gone black and the air conditioner is stuck on high and is freezing cold, but all the buttons associated with it don't work. So I can't turn it off or on,, I checked 3 fuses one display two air conditioning/clutch Please Help I also disconnected the battery for fifteen minutes

[@fupabox]

I wish I had some insight for you , but I know nothing about the Cadillac system

[@CharlesHeil-gk9kt]

Sorry not getting back to you. I tried what you said and nothing helped. Just got air coming out the front defroster and two side vents regardless where the setting was set - Defroster, floor or center air flow. Nothing out the center. The fan didn't seem to run real fast. I recharged the air system and the air got a little cooler but not much. Now today the fan stopped working all together. Needless to say this is making me sick. I can't get rid of the car. I just spent $435.00 to disconnect the locking system at a Benz dealer, towing included, and $450 for ball joints, tires and inspection. Does deleting a code fix the problems? I don't know what an air vent test is. I can't spend $100s more at a dealer.

[@fupabox]

Charles Heil sorry the air flap test is for dual zone climate control..yours has single zone...the air vents are controlled by engine vacuum..if the dealer disconnected the central locking (also controlled by vacuum) they have disabled the vents as well.

[@Qapital_J]

I also have a 97 c230. I don't know what I did but the light behind the screen doesn't turn on. The rear heat button doesn't do anything anymore. it continues to blow air after I turned off the ac (like in the engine) Please help

[@Qapital_J]

FIXED: The little wire that connects to the AC (the little lever) wasn't properly connected. I feel much better knowing it wasn't anything serious.

[@fupabox]

+minzi2047 Excellent :)

[@Qapital_J]

+fupabox I think the light still doesn't work

[@fupabox]

+minzi2047 the unit pulls out with the same keys as the radio...the bulb is prob. bad kzbin.info/www/bejne/oWXWkpysfJutmZI

[@MZ69123]

Hey hope you had a great summer! Anyway the climate control system has been acting weird it is switching between defrost center side and foot vents on startup. Evens out after it has been on for a while. Ran the Climate codes and 421 233 416 417 and 419 came up although only 421 remains after deletion. Pulse module...that sounds like what its doing any info on where it is in the car? Ty as always!

[@fupabox]

+William Z Pretty good hot summer..thanks. Hope yours was good as well.. 421 is fan pulse module.. located inside the drivers front wheel well under the fender liner...black box with a few wires/plug coming out..it controls electric radiator fan speed..it can get dirty and corroded up in there, and may just need a clean

[@MZ69123]

+fupabox Ty for the reply. The421 code is still there from the last time I forgot to replace the auto climate control fuse. I just did replace the secondary air pump with a boneyard part and I am wondering if this may relate to the vent shift at startup.

[@fupabox]

William Z HHmm I don't see how it could ..the air pump is just to decrease emissions when the fuel mixture is rich when cold ..the vent shift is possibly the vacuum leaking down when the car is off..it builds as the car is running ,then holds proper setting...once off it is leaking down...it is designed to default to defrost, so if the vacuum system fails, the area most related to safety gets the airflow...windshield

[@MZ69123]

+fupabox I found a slight air leak in the line that goes to a part that I am embarrassed to say I dont know the name of. The line originates from under the front top engine cover and goes to the part which is on the left side of the motor from the front and directly over the alternator.

[@fupabox]

William Z sorry late reply..been a crazy week..I'll try to find the vacuum diagram...which engine do you have ? I should remember , but have been in a medicated haze for a few months with an old neck injury..memory turns to swiss cheese :)

[@larrycrowl658]

I have a 2011 e550. the fan blows loud while driving and even after the ignition is turned off. After car is turned off the fan blows loud for about 2 min then shuts off. will your video fix the problem?

[@fupabox]

do you mean the engine fan ,or the heater fan ?

[@larrycrowl658]

Well I just took it to a Mercedes mechanic and he told me its my cooling fan :(. So I guess resetting the climate control panel won't help?

[@fupabox]

cooling fan always on high could still be an a/c issue or climate control issue, but unfortunately I am not familiar with the w212s heating and cooling systems

[@tamelacunningham5174]

2000 ml 320 fan not on when ac on in idle mode help? Warm air

[@fupabox]

the fan in front of the radiator ? or the one that blows air into the car

[@tamelacunningham5174]

fupabox radiator

[@fupabox]

There should be 2 aux. cooling fans visible when the hood is opened...with the car turned off and cold (make sure the engine is cold because you need to check if the fans will spin ,by turning them with your finger.. if they spin they are not seized..check fuse #44 in the fusebox ..it controls the auxiliary cooling fans.. there are 2 relays #21 and #26 remove and swap the 2 around.. if the blower inside the car still moves air like it should then the relay is fine.. if swapping the relays made the fan inside the car now not work, the realay is bad ( the 2 relays are identical for the aux. fan and the interior blower , so swapping them around is the quickest easiest way to test them. ) also check the big plug for the fans on the side of the radiatior.. unplug it and check for corrosion.. BTW does the car ever overheat ? The aux fans will come on for 2 reasons ..a/c on .. or engine temp high . If the fans spin by hand, the #44 fuse is good, and the relay test was fine , the likely cause is low refrigerant level in the a/c system..There is a pressure switch in the a/c refrigerant lines ..if the pressure isn;t high enough the fans will not come on

[@tamelacunningham5174]

fupabox thanks mr.box sure will.

[@michaeltocci6300]

If i new what i know now then no telling where id be?

[@sinsin69fifty]

will this work on my cl203 2001 C230 kompressor sports coupe?

[@fupabox]

+SĮŃŚĮŃ no.. different climate control panel

[@sinsin69fifty]

gutted…do you know if there is any help out there, will the w203 codes be the same as mine as control panels the same? what price am i looking at if i need to take it in to garage/MB specialist?…any help is great help

[@fupabox]

+SĮŃŚĮŃ what is the problem with your climate control.. what is the exact problem ? maybe I have the fix in my files

[@sinsin69fifty]

+fupabox I had noticed that the heating was on full and whilst looking at the control panel it was on 0 my friend in the passenger side then started fiddling about with the control panel and we was getting nothing, no hot air or cold, this was on a night of heavy rain and only started to happen as we parkd up and then returned to the car 30 mins later. On the way there there was no problem accept there has been no air coming out where my feet should be ( i think / this could jusat be me been unaware of the cars settings) , ive had the car for 3 months now but doesnt get much use as i only have a provisional liscence) …another thing is you can here it humming neer the dash where the air would normaly come out, as if its trying but just not getting nowhere

[@sinsin69fifty]

just so ure clear thats no rear window heating , nothing…just a hum coming from the dash when the nobs are turned up as if it was on its lowest possible setting , thanks fupabox hope this has been some/any help to fixing my annoying problem…

[@umerzai01]

how to close the vent/flap so tat outside air should not come inside car blower

[@fupabox]

far right "recirc" button on the hvac unit

[@umerzai01]

Hvac work good on highway but not in parking mood or locals road..and auto on/off compresor time is too less...compressor goes off very quickly what should i do??

[@fupabox]

check the refrigerant charge..it is likely low

[@maryannfuedan7684]

Hi my 96 Mercedes c220 is blowing out hot air ,do I have to delete the code in order to fix the ac?

[@fupabox]

yes

[@maryannfuedan7684]

@@fupabox thank you for your response, the code on my car is 231 and 227 both are sensor, do I have to replace those?

[@hellosunshine1090]

@@maryannfuedan7684 Google search 'Mercedes (your specific model #) (trouble code #) fix' IE Mercedes e320 code 777 Fix Read all posts / threads you find.

[@fupabox]

@@maryannfuedan7684 Yes the coolant temp sensor and the outside air sensor are pretty important to the climate control being able to work properly . Over engineered a bit , . The outside air temp sensor is a little probe looking thing that sticks out need the bottom of the front bumper . A lot of times it just gets unplugged . They are pretty cheap to replace if bad , and used ones are available on ebay etc. simple to swap out the coolant temp sensor is also a very quick job to replace , and can also just be a matter of a bad electrical connection . I don't have a video on replacing or removing it , but here is a good one I found that should help you with it .kzbin.info/www/bejne/aqO7gahjlKepmNk

[@maryannfuedan7684]

@@fupabox thank you so much ..

[@angelacohen7835]

All of buttons don't work on my control climate. It's been stuck in my n heat for 4 months. What are my options

[@fupabox]

year make and model of your car ?

[@angelacohen7835]

fupabox 1998 320 clk coupe MB

[@fupabox]

check the fuse (#20) in the fusebox under the hood , also ..is there anything being displayed on the climate control ? the buttons just don't work, or the whole thing seems dead, no lights, display etc. ?

[@samgraham7217]

@@fupabox I'm currently having that issue. Nothing is being displayed. The whole thing seems dead. It's now winter with freezing temps. Please help!

[@beautiful1morenita]

Hey my ac reads off and nothing comes on but defrost

[@madalin6969]

i have a 96 c 180,on the driver side it blows the right temperature and on the other only hot air!why??

[@fupabox]

Do you have dual zone temp. for driver and passenger ?

[@madalin6969]

no i don't!that's the problem

[@fupabox]

It has to be one of the actuator flaps under the dash.. you can get to many of them from under the glovebox and toward the center of the car

[@madalin6969]

ok!thank you,tomorow i'll try and fix it!!i'll let you now!!

[@tekere777]

The A/C off button will not go off. I have tried to reset it. However, it still turn on. My 2003 C230 does not have a climate control face to view codes. Please give me suggestions. Thanks!

[@tekere777]

Sorry it still off not on.

[@fupabox]

tekere777 if the E/C button stays lit...it usually means the a/c needs recharging....it will not go off because that would turn on the compressor, which would be damaged by running with a low coolant charge

[@BDoProductions3]

What’s 233

[@fupabox]

refrigerant temp sensor

[@MZ69123]

So I ran the codes and found PO507 confirmed,PO201 pending, P1747 pending---probably due to my cluster work, and PO460. Car runs fine but is only getting 28 mpg trip, but I was going 75 to 80 all the way. PO201 is the only one that concerns me

[@fupabox]

0201 is injector on #1 cylinder...prob wiring, 0507 is idle speed too high..likely caused by 0201...1747 is transmission electronic control wiring at speed sensor in gauge cluster..0460 is fuel level sensor, prob associated with the wiring in the gauge cluster as well... engine-codes.com/search_codes.php?q=p0460 that site you can enter the code on an it will tell the result by manufacturer..from what I can see the first 2 are related, as are the second 2

[@MZ69123]

***** Thanks. Is #1 at the front of the engine? Do you pinch and pull up to remove the injector conn? Wiring looks ok loom fine from what I can see. New injectors at 187k? All the other codes are probably from when the odo went to zero when I replaced the leds in the cluster. U on FB?

[@MZ69123]

William Z Time to get out the VOM I would say.

[@MZ69123]

William Z Is there a diagram that will tell me which harness on which computer goes to the #1 injector so that I can run its' resistance?

[@MZ69123]

William Z Have the diagram I need an actual picture of the ECU and PCM so I can tell which is which!

[@vuittonwoods5048]

Yeah it's a 417 code not a 416 sorry

[@sonnyvito504]

I got 232 233 416 417 419 and check engine is on anyone know what it is ? 2001 sl500 just bought the car 2 weeks ago I'm having a panic attack 😢