Mercedes w208 clk320 how to display climate control fault codes

[@thomasduhanez9271]

Thank you so much for this. The written procedures don't explain that it's absolutely necessary to hit both buttons EXACTLY at the same time. AC is ice cold now, thanks again!

[@smooondrosgaming643]

You are a LIFESAVER!!! Been driving without A/C since June (horrible heat in NYC this year) and couldn't figure out why it wasn't blowing hot air! Nothing was wrong with the A/C system, but apparently a dead battery left a code for the A/C, I reset it and it works perfectly with this method. Thank you so much dude!!!

[@fupabox]

glad it helped

[@jonmoser3183]

Best video to clear codes - seems like when codes in system EC hard to get rid of when starting car. Was able to clear codes and now works normal and can start car and EC does not come on automaticaly . Thanks - great info.

[@eduardozetina2412]

I didn't know about this. Thank for posting. I have a problem with my clk320's a/c and I going to check it out now. Thanks again.

[@fupabox]

Hope it helps 🙏

[@rocket5557]

Thanks worked lie a charm on my 2002 CLK320 after a having a hose swapped out and a freon recharge. Just reset the faults and boom ice cold ac again!

[@fomoshi]

Thanks a lot for that video. Helped me much!

[@armandh9287]

Thank you very much! Very interesting video!

[@leonforte7139]

Thk You for Demonstration hopefully i can Utilize this good info. Keep up the goood Work.

[@heyhej1]

Hi, for some odd reason on my w208 the AC or Heater comes on only if I play with settings on the steering wheel...like when shifting C to F or vice-versa.. Great video 🍻

[@swollen4ever]

Thank you I have 416 and 421. Gonna buy used duo valve. Where is pulse Module located it ? What does it do ? Thank you and merry Christmas 🎄🎅🏻

[@JuanMendoza-jr7xm]

Thank You Very much, it is very useful ... :)

[@andreasluther2909]

Hallo fupabox- Vielen Dank für die sehr hilfreiche Erläuterung des Reset. Habe soeben sehr viel geld gespart :)

[@girl600podcast]

Yay. Found a can of Freon on the shelf so I’m ready to go hopefully this was my only unknown.

[@fupabox]

Fingers crossed!

[@scottyscotty77777]

Great video. I need to recharge my system and bypass the pressure switch because of low refrigerant level and force the compressor to come on. Does anyone know where the AC relay is on a 2001 CLK 430? Thanks

[@Mookey1972]

Excellent video, Thank you very much!!

[@eduardozetina2412]

A question: my car ships in the screen that I have have a malfunction in the lights. I replaced a stop light bulb and checked the rest of lights out but I keep on getting the same "malfunction lights error" I'd there something like the a/c check you posted I can run to find out what the problem is?

[@znormand3690]

Great thanks! What does it mean when EC button stays red all the time (even when fan is off)?

[@fupabox]

usually low a/c refrigerant

[@glennnesbitt1068]

Thank you sir for your reply and the video !ink!

[@HC-cb4yp]

It took a long time but it appeared that I finally cleared the default, turned the car off, waited a while, turned it on and didn't feel any cool AC. Turned it off, went through the system check again and the error was there again. I assume it means that part, the coolant circulation pump, really is broken? The code was 416.

[@buggs9950]

My EC button light is permanently on/pressing it won't turn it off. My blower fan runs on its own, but not always. It continues with the ignition off. A previous owner fitted an isolating switch to the blower supply to turn it off. Everything else appears to work, well, apart from the A/C. The compressor clutch won't engage, I presume there's a leak. Are these issues connected? 2001 A208

[@aljinn89]

hi . ur video has helped me in the past and thank you so much . i ran into another problem and wanted to see if u can help. i have an 01 clk 320. yesterday ac stopped blowing cold air. the compressor clutch is not engaging. i check the freon and found it to be full. i then referred back to this video, checked for any codes. well im showing E61 234 and E61 235. this showed the last time i checked about 3 months ago but the ac was working fine so i didnt bother . i dont know much about ac systems. your help is greatly appreciated thank you

[@fupabox]

The 235 code is for freon leaking (emission sensor) either the sensor is bad or the freon level is low..likely the sensor.. B31

[@aljinn89]

Thank you Would you happen to know the location of it ?

[@aljinn89]

+fupabox i called the dealership twice they have no idea what im talking about . lol. this one guy said he been in parts for 19 years never heard of anything like that . thanks for all your help

[@aljinn89]

+fupabox still trying to find a forum that covers the replacement of the sensor. if you happen to know where its located that would save me 100s of dollars . literally. thank you !

[@fupabox]

bayhas.com/mercedes/203c-coupe/contents/climatecontrol/climatecontrol_sensors.html

[@nathanroger3092]

Thank you !

[@fupabox]

You're welcome!

[@flyntmyrick6291]

fupabox, Did you make a video showing what the numbers / code 1 and 17 means? This is shown in your video at 1:32. My CLK is showing 1 and 18.

[@fupabox]

its in vent flap test mode . heres the test and reset kzbin.info/www/bejne/ZmaVl2OGeL2inrM 17 and 18 are not useable numbers and seem to be used for other models using this hvac panel

[@sinsin69fifty]

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

Thank you very much :) i don't have to erase error code after refill AC over diagnostics :)

[@chrisgrocott713]

9

[@drewmcduffee]

Hi, I have a W208 mercedes and bought a new instrument cluster from Europe. When I start it up, the default on the display says "DISPLAY DEFECTIVE". But if I press the little 'R' button in the bottom right corner, it goes back to normal and displays all the correct information. Any ideas how to program this to get rid of "defective display" as a default? Thanks!

[@MrAeronca100]

W208 320 CLK 2000 I have a delayed power-up going on with the unit..no display no action from switches then after 10 mins it comes alive, guessing bad panel/control unit?

[@amanbadshah2016]

Okay thank you sir :)

[@MrVario777]

What do these multiple beeps mean?

[@tipiFWD]

Great video, thank you. Question? Will those codes display on the OBD scanner? Thank you

[@fupabox]

Nope.. The w208 is an orphan like a few other benz models from 1997-2000. Enhanced OBD functions very hard to read on anything but a factory scan tool. Regular OBD emissions stuff can be read with a simple OBD scanner but everything else is tough to get read. Thank god the climate control had one built in.

[@tipiFWD]

I replaced the compressor and the refrigerant pressure sensor at this local mechanic on my CLK 320 and the AC starts good and then shuts off at times only runs on speed one as soon as you crank it up starts blowing hot air any advice is appreciated thank you so much

[@tipiFWD]

Also, they filled it with Freon. I’m stuck in this heat wave with no ac.

[@fupabox]

@@tipiFWD open and clean out your duovalve ..it can cause many weird heating and cooling issues. theres a full vid on it on my w202 playlist

[@tipiFWD]

fupabox thanks a million, I will try that.

[@gbush1620]

Thanks for the video. My W210 got problem on AC. While starting the engine, it's look normal. After a few minutes, the central vent has almost no air flow and the the air go to the side vent and the wind shield (make its foggy a moment later). Today, I add AC Pro refrigerant and it's at green zone (about 33 psi). I check the climate control module and found 2 errors code: Eb1 234 - Sun Sensor Malfunction Eb1 416 - Coolant circulation pump Can you advise what I should do next? Thanks again.

[@fupabox]

check the coolant circ pump..looks like a fuel pump under or near the coolant reservoir bottle. check to see if the electrical connection is good and if it hums which it should when working properly. The sun sensor is just a little dome on the dash that senses direct sunlight and increases fan speed in auto mode ..doesn't have any effect on a/c .so if it isn't working it won't cause a malfunction. The coolant pump is the only thing that can cause your issue. If its working and humming , then the codes just need to be cleared and it should be fine.

[@glennnesbitt1068]

on my 2000 clk430 ,I show a 231 code,ECT sensor ,B11/4. How can I find and fix this? Thank you,

[@fupabox]

+Glenn Nesbitt Engine coolant temperature sensor.. located on the thermostat housing.. check the wiring to it first and make sure it is plugged in properly.. it is right at the front in the middle of your engine.. I found this video which shows how to remove and replace it kzbin.info/www/bejne/lZjQfoeMh7WXa9k

[@projodikromoconsuela1633]

i have a w208 clk320 but when the AC is on then after a while it is blowing only air so the AC falls out. do you know what i can to fix it

[@patriks7]

Great instructions! Luckily no errors and everything is running smoothly. However, do you have any idea where to find the fuse for the backlight? I put in LEDs a few months ago, everything was running smoothly when today, suddenly, both of the lights went out at the same time. I am assuming that the probability of both lights going bad is very low, so my first guess would be to check the fuse before buying new lights.

[@fupabox]

Patriks7 the fuse would be for the entire gauge lighting... since there are 2 LEDs in the hvac panel..they are likely like christmas tree lights... 1 blows and that cuts the flow to the second bulb

[@patriks7]

***** Thanks for the quick reply. After further inspection, I seem to have a bigger problem. It seems that the lights in my license plate and trunk don't work either. Well, the bulbs work (tried them in a different place), but there doesn't seem to be any power. I'll try to check the fuses, but no idea which ones can cover this. I already ordered new bulbs for the climate control backlight, as I don't have any other ones to test there. I'm starting to feel this might be a bigger issue that is out of my capabilities to fix..

[@patriks7]

***** Ok turns out you were exactly right. One of the LEDs died, which blew a fuse (who would have thought that the license plate lights and interior dashboard lights would be on the same fuse??). When I kept the bad LED in there, it didn't want to light up, but as soon as I removed it, the other one worked perfectly. Just posting this here in case someone has a similar problem :)

[@fupabox]

Patriks7 glad it's sorted out

[@Gocha909]

Thank you for this video. I've tested my car and there was only one fault,with code 416-Coolant circulation pump (M13) Can you tell me what this pump for?What it is doing? and what goes wrong when it doesnt work Thank you

[@fupabox]

the coolant circulation pump is located down under the coolant reservoir..looks like a shiny silver motor/pump with wiring and 2 coolant hoses coming from it..it is to increase coolant flow to the heater at idle and to pump coolant into the heater core with the car "off" in rest mode...when it fails you get very low heat in the car while idling and in stop and go traffic..also the rest feature which allows the car interior to remain warm while the ignition is off wouldn't work

[@Gocha909]

***** Thank you.I've reseted climate and after two days it seems that there is no more fault.I can't understand why it pop up but now everything is allright

[@fupabox]

Gocha909 the fault will remain in memory until it is reset..possible that the code is actually years old and has never been erased. You can always check the codes again in a few days and if it is still clear,then the recirc.pump is no longer at fault,or whatever was causing the fault (electrical connector that lost momentary contact..etc.) is no longer an issue...fingers crossed :)

[@Gocha909]

***** Thank you very much for help.I've testet my climate and fault is no longer there so seems that everything is ok

[@bekarioseliani8661]

hello, I have CLK 320 2000 avantgard, heater blower on climate turns off properly, sometimes (correctly often) it even doesn't blows at all, blower level is on maximum but it doesn't work. can you give me an advise what I have to do to fix it?

[@fupabox]

do this test to see if the fan is broken kzbin.info/www/bejne/j5zaoWecgLWUh7s

[@LOONIBEATS]

I reset the same two codes I got and they came back 241 and 416. I refill the ac with r134 and hissing sound comes from vent and not a/c compressor. So it's definitely the 416 correct? but what does coolant circulation pump has to do with a/c?

[@fupabox]

The coolant pump operates all the time to keep the engine from developing hot spots when the rpms are low. it also operates the "rest" function to heat the interior when the car is off..I'm not sure why it would keep the a/c from working

[@LOONIBEATS]

would the 241 refrigerant code make the pump not work properly or throw codes to the system. the air is still hot. Oh I just check the gauge and its in the green but a lot lower reading. and it seems as its not going in the r134a is getting cold as heck

[@fupabox]

LOONI BEATS the refrigerant code won't stop the pump. I would change the pump with a used one first

[@jimmybeee5]

Hi, I have a 226 error and I can not get it to clear. The auto button on the driver side of the controller is not functioning. The in car temp sensor seams to be working fine after I cleaned it. Could this be keeping my AC from working correctly. The display code #1 seams to be reporting an accurate reading of the in car temp. Any ideas on clearing the fault? I tried disconnecting the controller but the fault is still there. Any ideas on fixing the auto button?

[@fupabox]

I would think the fault is in the auto button ...you may be able to gently pop thr button cover off and see if the button underneath is stuck in the pushed in position . Otherwise the dash unit would need replacing

[@sleeplessgrave]

hello i know this is an old video but wondering if you can help me out. so i get to the part where it says E, but when i press the auto again nothing changes. doesnt show me any error codes, it just goes to F.

[@fupabox]

just means there are no error codes

[@doanhdong6514]

Do you know how to do for GL450 2007? Thanks

[@fupabox]

as far as I know, there is no procedure to do this with the x164 climate control

[@doanhdong6514]

Thank you. That is reason why I could not find instruc any where

[@stevenskinner6747]

It seems that you know quite a bit about the cooling/ac system in w208. I have a good question about it that I hope you can shed some insight towards. When I first start my clk430 the AC is good and seems to work great until I start driving and then what it does is direct all the AC air out of the windshield vents and a small amount of air will come out of the side vents. Almost no air at all will come out of the center vents. Nothing I can do to get it to come out of the center vents after the car is hot and been running for a bit. Ever heard of such a thing?

[@fupabox]

The w208 chassis is based on the w202 and shares many of the components including a/c and heating . The issue you are having seems to be vacuum related. The flaps that open and close to direct air to different areas are controlled by engine vacuum . At idle there is a lot of vacuum with the throttle plate closed . Once the throttle opens there is much less vacuum , so there isn't adequate vacuum to hold the flaps open that direct air to the center vents . There is a default for the air to flow to the windshield and side vents so that a fault in the system will send air to defrost the windows..all in the name of safety. there is either a leak in the little rubber bellows that hold the center flap open, or the distribution block that sends vacuum to other areas of the car (you can get to the distribution block and partially see the vent bellows from behind the glovebox) also check all your rubber and hard plastic vacuum connectors under the hood for a leak , but it likely the bellows has a tiny tear or leak.

[@dodaro48]

this happened to me also. there is a vacuum line center on back of motor. there is a port back there and it plugs into a white plastic line. also i have the v8

[@stevenskinner6747]

Fupabox...is the bellow that controls the center vents in the front passenger wheel well? Looks like a grey box that has a white tube and green tube coming out of it. What do I do once I locate it. Just check for any damaged tubing or replace the box? And I do believe one of them goes to the back of the engine and I can't find where the green one goes...I would guess to the vent. Would I have to remove the dash to see the other end of the green tube? Crazy system just for vents!!!! One more question...do you have a diagram of all the vacumm tubes around the engine and where they connect to? Thanks in advanced for all you help...

[@fupabox]

If I'm not mistaken the flap for the center vent blend door is behind the radio / hvac control unit . here is the factory manual sections (listed on left hand of page ) you may need to refresh once in a while if the page doesn't respond ..workshop-manuals.com/mercedesbenz/clk_320_(208.365)/v6-3.2l_(112.940)/heating_and_air_conditioning/air_conditioning_switch/component_information/locations/ec/

[@ataulahmad18]

Hi I tried the flap test and didn't really know what I was looking/listening for so I turned my car off and on and the did this fault code test. I got E61, which you say is duo valve (not sure what that is) and 422. But main problem now is I then turned the car off and on again and now all I get is hot air through my vents?! Any clues? Thanks.

[@fupabox]

the duo valve is the valve under the hood that regulates hot coolant flow into the cabin to control temperature..if it is faulty it will remain in the warm setting and not allow you to get cool air into the interior...check my duo valve repair video..it is easy and costs nothing to repair

[@ataulahmad18]

Thanks for your reply. I did some research and found some things out in the meantime. It was sorted without much effort tho.... strange, I know. I pulled the fuses for the duo valve and put them back. Either that did it, or it just took longer to cool down than normal when adjusting the temp from hi to low. ***** to your video if needed ttho. Thanks again :)

[@ataulahmad18]

Baseer Ahmad *I'll refer to your video. ..*

[@giorgigaimarjvashvili964]

What 422 mean ? Faulty climate control or what?

[@amanbadshah2016]

I have 99 clk 320 and I don't know what's wrong my car whenever I tried to start my car it didn't start and in few min it's start. Please help me out with it please I really need help and if u can make video about I will be really appreciate with ur help thank you

[@fupabox]

check the battery in your key..if the battery is getting weak it has a hard time sending the coded signal to the ignition

[@anthonymancuso]

Hey Craig..i did the code test. I got only one code msg. (E61 416) I notice in your video you got an E61 418 & 471 code. I heard you said that it was.. "being a problem with the Duovalve..left or right etc.." BUT I notice in your list the 416 code is for Coolant Circ Pump..? Is there a similarity there? Also what exactly is the E61 # meaning on the left side of the display...does it coincide with right code # displayed on the right side of the screen?? and the main question though it may be a dumb question..lol Do i have an issue with the A/C, or I'm guessing its possibly an old code that's never been cleared. I am getting cold air, (though sometimes not as cold as i like, living is Los Angeles) I know its not Joshua Tree..lol But it gets hot here too..your thoughts?

[@fupabox]

The E61 is actually Eb 1 then the code all the codes begin with Eb1,,,, the coolant recirc. pump and the duovalve often trigger each others codes as they both control/restrict coolant flow. The A/C won't work properly with old codes stored inside...so it's best to erase them and see if they come back

[@anthonymancuso]

Yep..just ran the check again..code is gone. :)

[@fupabox]

A Mancuso hopefully all good now :)

[@anthonymancuso]

Hey bro..ya. im good on the AC front..Never really actually had issue other than having to take it to my Benz contact here in LA who put some refrigerant in it for $20.00 last year. I like it really cold..lol The issue i am having tho with the AC as i mentioned in the other thread for the Valve closing and opening. My center valve seems not to be closing all the way..i get a bit of moderate air blowing thru even when i have the AC in off. They when i turn it on it blows according to how i adjust it up and down..like i said it may be a bad elliment behind the dash thats controls the open close to the center vent on the dash. YOur thoughts?

[@fupabox]

A Mancuso my center vent never really goes all the way off either...I think it's designed to never go all the way off...maybe a Germanic attempt to keep fresh air coming in and keep you awake :P

[@josephbynum525]

How do get the blower to work again

[@josephbynum525]

It didn’t work I reset it didn’t understand what u talking about

[@petebringans4306]

I have a 2000 clk320 but air cond display doesn't even light, also when it stopped the radiator fan became louder. Desperate for a solution

[@fupabox]

sounds like a bad control unit defaulting to full speed on the rad fan as if your ac is on ,on a hot day. They can be found cheap on ebay and pop in and out in 2 minutes

[@cameroncastel8370]

Getting eb1 on leftside and 416 on right

[@kimmorrison7573]

I have a clk430 and my ec light is stuck on I can only read sensor codes but I cannot find codes because ec is on any idea how to get it off. I hit it by accident and now it is stuck. Any advice.

[@kimmorrison7573]

+kim morrison sensor readings were 1-118 2-111 3-140 4-136 5-108 6-205 7-10 8-120

[@fupabox]

+kim morrison sorry for the late reply..youtube no longer sends notifications by email of comments, so I have to find them in other places... any way...using a toothpick or wooden BBQ skewer you can pop the button off, and then you can push the inner button under the cover to shut off the e.c. button

[@fupabox]

+kim morrison .. Not sure of any of those readings ?

[@petebringans4306]

I do not have any display at all, help

[@mokabal1697]

thank you , i did that , the code is 416 and didn't reset what should i do ,

[@fupabox]

+adel ali 416 is the small booster pump under the air filter..it has coolant lines running in and out of it..check the connections to the pump... turn the car off and press the "rest" button...open the hood and put your hand on that pump, it should make a whirring noise every few seconds

[@mokabal1697]

thank you very much fupabox

[@LEVENT1985]

Merhaba,paneldeki tüm ışıkların hep birlikte yanıyor ve kumanda etmiyor nedendir

[@giorgigaimarjvashvili964]

hello fupabox i have 227 - Outside temperature indicator temperature sensor (B14) and i don't now what is this can you help me?

[@fupabox]

+Giorgi Gaimarjvashvili there is a little black probe mounted in the front bumper about the size of your thumb...it kind of sticks out from one of the openings for fresh air in the bumper..check it for damage or loose connection

[@giorgigaimarjvashvili964]

if this sensor is damaged may conditioner not work?

[@fupabox]

Giorgi Gaimarjvashvili it may in automatic mode...in manual mode it should be ok..I'm honestly not 100% sure

[@giorgigaimarjvashvili964]

my car won't blow cold and hot air heater blower is damaged

[@giorgigaimarjvashvili964]

sorry for my bad english

[@CarlosLopez-tu9bx]

HELP ! I HAVE A W 208 THAT BLOWS COLD ONLY IN THE MIDDLE VENTS , WHEN I COMMAND IT TO BLOW ONLY YO THE DEFROSTER OR ANY WERE ELSE IT BLOWS STILL IN THE MIDDLE AND THE REST OF VENTS ARE HOT. SO ONLY COLD IN MIDDLE AND REST OF VENTS HOT !! PLEASE HELP !!

[@fupabox]

Not designed to blow warm from middle vents if I recall correctly. shut off vents manually

[@GungeScleraEmpyaema]

something weird happened as i was playing around with the unit i can no longer turn up /down the speed of the ac and my auto buttons don't work what works is the REST button and the EC button that come on as soon as i push the buttons and the unit shuts off when i press the REST button also i hear this noise from inside the car something is going on and off any idea what is going on?

[@fupabox]

GungeScleraEmpyaema try unhooking your negative battery cable for a few minutes and see if the unit will go back to normal. It seems like something may be stuck.. possibly one of the buttons... were there any problems before you began the test ?

[@GungeScleraEmpyaema]

***** there was the unit was working and i could change the speed but i couldn't manipulate temperatures or the "auto "buttons didn't work nor the "circulation" button and i always had something like "1" on the left and "35" on the right the rear window defrost button wasn't functioning before but now it is the only button that comes on and off so yeah that's what it is.

[@fupabox]

GungeScleraEmpyaema if unplugging the negative battery cable doesn't reset it, you may need to get a used one on ebay or at a wrecking yard... I have never seen one go bad, but it can happen...the only other thing that could possibly help is a Mercedes star tool can scan the unit, but the price of doing that would be around the same as getting a used one..

[@GungeScleraEmpyaema]

***** no it didn't. or was i supposed to unplug the negative cable while the unit was on? cause i didn't do THAT i just unplugged and plugged which messed all the memory settings. not a big deal but what if i unplug hte positive this time? or both? while the unit is on like i told you this thing can turn on by pressing the REST button and if it's off there is that noise starts to come out.

[@fupabox]

GungeScleraEmpyaema no don't unplug the positive...always unplug the negative battery cable first on a Mercedes..Don't do it with the unit on. I think there is something wrong with the climate control unit. The noise is likely the circulation pump which is activated by the rest button when the car is off... if it is coming on while the rest button is off, something is messed up inside the control unit

[@josephbynum525]

Was playing with the button now my blower fan not working what can I do

[@fupabox]

Once the procedure for reading the codes is initiated you have to go through the whole process ,read all the codes and do the reset or it will remain in the fault reading setting

[@josephbynum525]

@@fupabox what procedure do I do

[@josephbynum525]

So once I do what you shown everything will go back to normal

[@juristudio3184]

My heater motor keep working after I switch ignition off. Only way to stop is take fuse out

[@stevemorris9427]

Hi Juri'Studio, mine too! did you find the problem? i also have to remove the fuse to get the fan to shut off, is yours fixed?

[@mrtakemytyme7162]

I tried to refill my ac but it's showing on the gauge maximum in the red

[@fupabox]

check the coolant pressure sensor

[@mrtakemytyme7162]

@@fupabox thank you I appreciate your time

[@mrtakemytyme7162]

Also it I get the code for circulation] pump witch I assume is the ac pump but how could be a problem there is kicking on

[@fupabox]

@@mrtakemytyme7162 The circulation pump is on the frame under the coolant bottle. it hooks to the coolant lines and circulates antifreeze to prevent air in the system,and when engine off and "rest" button engaged. If circ pump isn't working your mono/duo valve may be gummed up and stuck in the default "warm " position .kzbin.info/www/bejne/bpvLgXicga5na9U

[@fupabox]

@@mrtakemytyme7162 sorry for late replies .. when I'm busy with work I sometimes don't get time to answer questions.

[@jorgschubert2570]

Mercedes Temperaturanzeige geht nicht

[@TheAwakez]

Could you please very briefly explain what exactly does EC ( the economy mode ) do and when am i supposed to use it ( summer/winter time ). I thought i knew how to properly use my climate control untill recently when i had this guy in the service center checking my AC, told me that i might have been doing something wrong with my AC, which i don't quite remember what it was, but it definitely had something to do with the EC button.

[@fupabox]

the e/c button turns the a/c compressor off ...when e/c is lit up the a/c compressor will not come on no matter how low you put the temperature. The reason you would have e/c engaged (I leave it engaged most of the time ) is for the best fuel economy and power.. a/c compressors use a couple of HP to turn them ..if you put the climate control to front windshield defrost, the a/c compressor will automatically come on to help dry the air to defog the windshield , so in winter I only use front defrost when absolutely necessary

[@TheAwakez]

Right... so basically you just turn the AC on by pushing the plus button, set the desired fan speed, push the air recirculation button and enjoy the the cold air flowing out of those vents in a hot summer day and then you would just turn it off by clicking the minus button untill the fan completely stops or just shut the engine off without even touching the e/c button, i'm a bit confused sorry :) Got the defogging part though

[@fupabox]

Heisenberg Mercedes actually does make it a bit confusing..their assumption is that everyone will leave everything in automatic mode...essentially e/c button not lit up is a/c on when the car thinks it needs to use it. e/c button lit up means the a/c will not come on ever. ( unless in defrost) for the most effective temperature control set the temperature you want and press "auto" the car will do the rest and you will never need to touch anything. If, like me you don't really like the feel of a/c unless it's blistering hot.. you can leave everything else the same and just press the e/c button to disengage the compressor.. when its too hot turn the e/c button off and the a/c will engage to cool you down

[@TheAwakez]

Got it, thanks!

[@juniorsolis2010]

Doesn't work of the ec is stuck on

[@girl600podcast]

Uh oh

[@mrtakemytyme7162]

Ok so I have a update I did get pressure adjust correctly but I'm getting 232 233 241 418 416 but when I hook gauge it reads where it should be the pump I can turn on off by ec button the gauge is steady so it's not leaking I'm at a loss any other suggestion and I'd like to donate to your channel for helping me out thank's again

[@fupabox]

did you try to reset all the codes. could be old ones stored that are keeping it from working

[@mrtakemytyme7162]

And that's restting thro the climate control like I. You video ? If so yes but then I receive the same codes over

[@mrtakemytyme7162]

Do idk why but it won't reset I changed my duo valve I can't seem to find the recirculation pump

[@fupabox]

@@mrtakemytyme7162 attached to coolant overflow tank by a small hose. looks like a fuel pump. 1 electrical connector and 2 smaller hoses about 1/2 inch in diameter

[@mrtakemytyme7162]

@@fupabox hey giving you a status update so I had a extra duo valve and aux pump I just got done changing pump and it seems to be working maybe since it hasn't worked in who ever knows how long I'll take it on the high and real they the compressor working thanks man

[@tribeofjudah]

My EC light will not turn off

[@paulattree4171]

I broke this unit trying to remove it. So i just put it back as i found it but now none of the buttons work. BUT my rad fan is now on all the time. Is this cos i broke the unit.

[@fupabox]

Yes. as a safety measure the fan defaults to high speed and likely also defrost .

[@paulattree4171]

@@fupabox Yes i eventually found a used unit on ebay for €35. I jumped at the chance because everywere else i had been looking were all £90 plus. It works a treat. Only thing now is the ac dont work. Going to try charging it tommorow. One problem ive got error code 416 . Believe it is coolant circulation pump. Should i still try to recharge it?

[@fupabox]

@@paulattree4171 you can still charge the AC . The coolant recirc pump is the one on the front frame behind the coolant bottle. A smaller coolant hose connects from it and pumps warm coolant to keep the interior warm when the car is off and you engage "rest" button . If the pump isn't working it can slightly restrict heating in the winter . Usually the wiring connector that makes the pump not work . After the car is warm shut it off remove key and press rest button on AC unit . if you put your hand on the pump you should feel it humming .