Replacing Hot Cold Blend Door Actuator Driver Side & HVAC A/C Reset - 2002 Chevy Trailblazer LT

Replacing the Driver Side Blend Door Actuator (ACDELCO 1572972) and reseting the blend doors for the front A/C system. My A/C was stuck on just hot but this repair restored hot/cold functionality to my driver side through the climate controls. At the end of this video I show you how to do a full HVAC recalibration reset on your front A/C blend doors.
The part I used ACDELCO 1572972 (Driver side, blend door, temp, hot/cold) --- amzn.to/31oVcsS
ACDELCO 1573044 (Driver side, mode) --- amzn.to/2YJMXpz
ACDELCO 1572972 (Driver side, defroster) --- amzn.to/31oVcsS
The equipment I use to make videos:
(Camera) Cannon Vixia HF R700 --- amzn.to/2FSoBTn
(Microphone) Rode VideoMic --- amzn.to/2XcNOSa

[@WritersHiveMedia]

Is there a link to the passenger side blend door actuator? I only see the driver side.

[@A.GH7]

I just reset it and worked in my 08 Chevy Trailblazer , I wanted to start from easy way, and works And I am weak in English And I understood every step in the video >> thanks a lot bro

[@jtdoe99]

I understand about resetting the system. But if the old actuator was bad and you replace it with a new one, the position of the door is not in the same relative position as the new actuator. The actuator also has a limited travel distance between hot and cold. How do you know how much to open or close the vent to line up with the new actuator?

[@roberttucker4430]

The videos on KZbin were extremely helpful with this project. I estimate it saved me half a day in trying to figure out disassembly for access. The replacement actuator I used was found on Amazon, and it required that I open the case to realign the gear to match the the default (hot) position of the shaft connection. When I got it right the actuator practically fell in place. Calibration went without issue. Not a pleasant job to do, but I got a quote of over $1,000.00 from a local shop to do this job. That’s a lot of incentive.

[@justbored3.14]

I have a 02 tb and on the driver side it only blows hot air. I know it's a actuator problem but which one on the left driver side. There are 2 right?

[@mr.b4444]

Thank you brother. I have a 2002 Trailblazer and your video saved me $$$$$. For a while I thought I could get away with just blowing the AC through the passenger side vents but in Arizona that's not enough. I'm a larger old guy so it was a challenge for me getting up under there, but I was able to do it in about an hour and a half. That top mounting screw for the actuator was the toughest one to get to. I didn't have to calibrate it either. So now my Trailblazer gets so cold it may start snowing inside. Thanks again!!!

[@ballzach8160]

How did you get to the screw on the actuator? Do I have to really pull the entire dash?

[@n-joysilver7752]

This actuator is relatively easy to replace. The one that controls face/feet direction of air is what you need to worry about on an 02 trailblazer. That actuator is tough enough to reach, but often the mechanism that actuator moves is broken, which requires entire dash removal to replace. GM improved this design flaw in 03. All these TB's are known for actuator failure, which is often caused by disconnecting the battery. The actuators break when cycling upon reset when battery is reconnected. Always use a backup power supply when changing battery!!!!

[@patwatson9441]

I knew NTB was the reason my actuators are broken. Went in for a battery and all of a sudden my ac is not working.

[@kingnasty5381]

Hey question. Driver side blows ( force of air) much lower when placed on heat mode than passenger side. What actuator handles tht?. 2006 trailblazer

[@jbaltazar8640]

How can we tell which one out the 2 need to be replaced?

[@BBAILEY466]

Two days ago, I replaced the Mode Actuator and the Blend door Actuators, I am glad I found this video, where you stated, you had to reset the system several times, I was just about to dig into my dash on my 2003 Chevy Trailblazer again, when I saw the end of this video, so I went out and the reset again and my AC system is working as it should, whew that was close. I thank you for your efforts to help us out.

[@savorwithdmurph1113]

So glad this video saved you some time working on the actuators! That's why I post, and I love to hear how I helped you with the job! The reset is a life saver and the work isn't too hard with a proper tutorial =) Cheers! - Dmurph

[@michaelcecero7599]

what part number did you use, the one listed in post, is not suppose to fit my 2003 trailblazer EXT lx

[@i3017]

Thanks for this video! But what if only hot air is blowing on both sides (driver and passenger), which actuator(s) needs to be replaced?

[@sharonwallace9018]

When you put the actuator back on the white post may not line up with the new actuator. What you have to do is snap off the top and take off the little white gear, position the actuator (I used a garden kneeler for my knees and rested on the top part of my left shoulder. Inside the car) and put the screws in then replace the white gear and snap the top back on. If your gear post is not lined up with the hole you cannot install this. This is only way to do it! I replaced ours and now I have cold air on the driver side. Thank you so much for your video. I wish you had included the part about the gear post not lining up with the white hole. I’m sure it does not lineup for most people. Oh when you takeoff the top white gear you can then move the black gear to approximately the correct position. You have to look at the white post and see if it’s going straight, sideways, or what. Once you replace the white gear you cannot change the position of the black gear which must match the post! I’m a fix 56 year-old lady and yes I’m a tomboy but I don’t do many things like this and I fixed my air-conditioning today.

[@Nonotkidding]

Thank you for your personalized (self talk and pro) method. I bought all the actuators instead of 'being inconvenienced by a dozen interruptions. I fixed the main blender gear, and will keep it as a spare. Also, thanks for the food channel. I'm beating insulin resistance with Steve Gundry and your suggestions, God bless, Jon

[@Leolioness44]

The two front Center AC vents I had hot air coming from the passenger's side and you could feel cool air coming from the driver side vent. It wasn't actually blowing out but you could hear the blowers blowing. Putting in the blend motor actuator now hoping this solves the problem

[@o2bkjohn]

I've tried resetting the system and it doesn't work. Air blows from the floor, side vents by the windows and defrost area but not the front vents. Help!!

[@richv7095]

How do you replace the valve vent lever. I broke it replacing the actuator. I can't get the old on off to put the new one on. Thank you.

[@jayneadeau3887]

This video is great except for the 2005’s they stuck an extra plate into that access that prevents people from accessing the top screw. You have to dismantle the entire dash. GM engineers suck. They want you to bring it in to a shop so they can charge you bookoo bucks. Shitty world

[@savorwithdmurph1113]

Bah! Sorry to hear about that my man... These cars are getting harder and harder to work on.

[@jayneadeau3887]

It wasn’t hard if you know your way around cars. But it’s a lot of extra work just to access that top little screw. Versus accessing it through that area on the 02’s. We’re talking 30 min job maybe - extra hour or more.

[@yoboi01]

You couldn't show how you got it out ?? That's where we needed to see. It wouldn't pop out

[@savorwithdmurph1113]

After removing everything I pulled on the metal piece to make room and wiggled it out. It’s a pain to do because the space is tight but that’s what I did for removal and install.

[@Newman81964]

What is the difference between the different actuators that look exactly the same, but have a different part number? The original part that was in mine at that location had the number GM 16164972. There is a ACDelco part (1573598) (GM 89018676) that looks exactly the same (and I do mean exactly) but it is half the price of the part you are saying about. What is different between them?

[@jasonbrown467]

every video and instruction i have seen said to pull fuse 39, its labeled "b" and its 10 amps, you said it was for the rear. the one you pulled was number 44 and was a 30 amp fuse. 30 amps for that control unit in the dash is over kill, right? maybe you got it working, i dont know, it seems like you did, but you also said you thought you had it before and it stopped working so you decided to calibrate it, but you pulled the wrong fuse. i am confused how you had success. when you pull the "b" fuse and turn the key on and DO NOT TOUCH ANYTHING ON THE CONTROL UNIT. you should hear and fear the actuators moving the doors and re routing the air flow.

[@savorwithdmurph1113]

The fuses are all the amps that GM recommends on their fuse cover. What I did works as my actuators are all working great. I've fixed three actuators before and can tell you that much. When you pull a fuse and put it back in you'll hear the actuators whirring that the fuse effects. That one worked for me. Nothing to debunk here and there may be multiple methods to resetting actuators.

[@savorwithdmurph1113]

39 is HVAC I on my Chevy trailblazer. 36 is HVAV B. 44 is labeled HVAC and may reset all of them? Also... if you actually watched all of the evaluation you would have seen where I do adjust the temperature controls.

[@jasonbrown467]

@@savorwithdmurph1113 i watched the full video btw and thanks for the quick response!!. last summer i dealt with these actuators on a newer trailblazer so i was watching videos to freshen up on the theory of operation as i have another trailblazer with some hvac issues with those pesky actuators . i came back inside, as i was just outside looking at my system again to document my observations and saw your response. i tried your method and i pulled fuse #44 which is 30 amps and did not trigger a re-calibrate process, then i moved onto fuse #39 labeled "hvac b" and this worked for the re-calibration process. i googled fuse 44 and it seems to be for the blower moter, which explains the high amperage fuse, but i wont be going out again tonight to confirm. sounds like your actuator was dead since it was stuck on heat. did you confirm no movement before replacement? perhaps that is why just putting in a new one worked? my driver side seems to be about 15 degrees warmer than the passenger side. i got visual confirmation of movement on both driver and passenger side actuaators when i slide the temp sliders up and down, and i can control the temps of both sides, but i cant confirm the proper amount of movement of the driver side as i didnt take anything apart to look for that splined shaft to move, i just peeked under there and saw it moving some. good times

[@savorwithdmurph1113]

I just pulled my fuse 44 to get to the bottom of this and it reset my front actuator. My trailblazer is a 2002 LT EXT so it may be that the process is different from your model? My actuator was about to go dead and was slightly moving with only hot air. I replaced the actuator and it still didn't work so I had to reset it three times by pulling fuse 44 before it worked properly. Fuse 39 also resets the front actuators. I hope your repair goes well. These cars have complicated systems and can be quite different.

[@pshon0240]

This is the best complete video. I can follow step by step. Thank you!!

[@sticky.kumquat8395]

I didn't have to take anything apart in my 09 tahoe. Just move the vent and there it is.

[@bud4jesus]

Dumb question, is there an actuator on both sides?

[@tcswag801]

How to tell which ones shot ?

[@savorwithdmurph1113]

Unfortunately it takes a schematic of your actuators. Each one has a purpose so when it's missing that helps identify. I used schematics of the system to figure our which ones were going bad. Places like Rock Auto also have descriptions of function.

[@marksmithjr00]

I have a 95 Buick Park avenue do I need to do all actuators? I got my air conditioner fixed today but my driver side plugs cold and my passenger side is hot

[@savorwithdmurph1113]

That could be the actuators. Especially if it doesn't change when your changing the temps on the dial.

[@robertpaz9957]

Thank you. I was struggling for 30 minutes in an awkward position, then gave up and found your video as I could not align the actuator. Had it on in less than a minute after watching your video. Secret was aligning the white post using the power on and off. Also, placing the actuator on the peg helped with alignment. It was my GF car and I was her hero thanks to your advice.

[@fairkim1234]

Hi Robert - what exactly is the default position for the white post? I put it back in to roughly same position it was in when I took out the old actuator (the white thing was still attached) and installed but it still makes a clicking sound - much better though, now it makes a brief clicking sound when I turn the car on but mostly goes away. I think I’m just a bit misaligned.

[@robertpaz9957]

@@fairkim1234 Not sure, I just winged it until it fit on. My GF has reported the same thing though, occasional short term clicking, but much better as it was incessant before. I researched it and found that there is a calibration process which i haven't tried yet. As my vehicle is a 2005 Jeep Grand Cherokee it wouldn't work with a Chevy. Also, it was mentioned in the Jeep forums that you can do a diagnostic scan to check and also that the Jeep dealer was contacted and wanted 100.00 to "reprogram" the actuator. Here is the Jeep calibration process just in case you may have a jeep too and the url to the forum. Good luck. www.jeepforum.com/forum/f67/hvac-actuator-calibration-test-3358978/ 1. Turn the ignition to the ON position. 2. Turn the blower motor control to the OFF position. 3. Press and hold the EBL rear window defrost switch down and turn the blower motor control on. Continue to hold the EBL switch down until the EBL (Electronic back light) status indicator begins flashing, then release the mode switch. While the test / function is running the EBL status indicator will flash once per second. If the test / function passes, the EBL status indicator will stop flashing. If the test / function fail, the A/C and EBL status indicators will flash alternately.

[@drivewaygarage1561]

I'm guessing it helps to move your seat back as far as you can

[@Ninjanatezx6]

Please help me with a part number idk wtf I'm doin wrong but I cannot for the love of god find the same actuator, none of them have the wide opening and teeth in the inside... :( please help!!

[@savorwithdmurph1113]

Hello Nathan, what is the make, model, and trim of your car and what actuator are you trying to replace? Give me as much info as possible and I'll find the part for you.

[@bloodsweattears287]

Mines blows defrost but not on face do i do this

[@DadnKidsOffroad]

how about the passenger side?

[@DavidBrown-mq1pq]

I need it for a 2015 Chevrolet Camaro

[@Freakytaco]

I have a 02 Chevy Trailblazer LT your videos are definitely helpful and help me out a lot but there is one thing the center console AC mine just keeps blinking back and forth back and forth any help with that thanks a million

[@savorwithdmurph1113]

Can you describe your problem in more detail please? What is blinking back and forth?

[@Freakytaco]

The center console on the second row behind the driver and passenger there's a small console unit that has AC adjustment radio tuning and 12 volt cigarette lighter outlet when I cut the AC on it works good for the front row and AC works good for the third row but the second roll the display just keeps blinking on and off and if someone's in the second row. Trying to adjust climate control they cant do it so have you had this problem with your T.B? Thanks for the reply

[@savorwithdmurph1113]

The first thing to look for is you should have a rear switch to control what the passengers can access from their A/C console. This should be to your right near your armrest. Have you checked what setting this is on? I would imagine that you could use this to lock out the passenger control. I read this in a post online. "You should have a knob just to the left of the gear shifter that has R, 0, 1, 2, and 3 on it. This allows you to control the fan speed of the rear HVAC from the front. To grant controls to the rear, the knob has to be set to R. Hope that helps some." forums.trailvoy.com/showthread.php?t=68613

[@ironhead320]

Were you getting hot air.out of all the vents when the old ones were bad.I have no cold air all hot and compressor is running

[@savorwithdmurph1113]

I was getting hot air just out of one. A good test to try is give your car power, but don’t turn it all the way on, and adjust the hot/cold lever. You’ll hear the actuators moving if they still work. Is the refrigerant charged properly?

[@ironhead320]

@@savorwithdmurph1113 i can hear.them move but 3 days ago it.worked fine now all hot air there was 2 mornings that were real chill i moved the temp up a little for warm air now all hot.air.and system has the right amount.of freon in it

[@savorwithdmurph1113]

Just checking, your passenger and rear vents are hot as well when set on cold? Also has the battery been unplugged recently? There is a process to reset your A/C actuators. I would try that and see what happens. You pull all of your HVAC fuses in the rear fuse box wait 15 seconds put them back in. Then turn on your car wait for the actuators to adjust (you'll hear them whirring) once they stop adjust your dials and see if you get cold air. Then turn your car off and on to see if the system reset. Sometimes this needs to be done 2-3 times. If your actuators need to be reset, the A/C will blow cold air when you turn your car on for the first time. In this video I discuss resetting the HVAC system in more detail at 5:05. You'll need to pull the 3 at the bottom of the fuse box. kzbin.info/www/bejne/i5eXaHqwZ9ybfJI

[@ironhead320]

@@savorwithdmurph1113 no turns out mine has a dual unit and after 5 minutes of running the psi drops to 22 so needs more freon

[@savorwithdmurph1113]

Awesome! That is an easy fix 👍 glad to hear this is resolved. Cheers!

[@Loretajean]

Can’t see your big head in the way

[@dariustambasco5457]

I have an O9 trailblazer and I watched your video twice. I have more metal that I’m not able to access the top of the actuator. I don’t know how you did it.

[@msa_0619]

Hey dude I have 05 Chevy Trailblazer Lt with my HVAC on the drive side blowing HOT air 🔥😓 not cold 🧊. Do you know the part# actuator? I'm calling from Houston TX. Oh keep up the good video on here ok

[@jeffallen7923]

I’ve replaced bothe mode and defrost actuators. Still nothing but air from the defrost vents. I can watch the actuators and have zero response from them when vent modes are changed. Any ideas guys???

[@nordicpride9708]

1/4 bits are your friend. I only use all 1/4 doing dash work on any modern car or truck. You also should get KOKEN universal joints. 3/8 is much too large for this kind of work and the torque values involved.

[@michaelsj8949]

So the 1st item you change in the bacl is the hot & cold system.? My Chevrolet Trailblazer 2003 blowing warm air from the top backside.. NOT COLD..🤦‍♂️😔.. Anyone/Anybody Prosperous Response Welcome... thank you..

[@johnkozlowski7642]

What if the blend door aviator doesn’t work at all no noise at all on the passenger side.

[@savorwithdmurph1113]

This is passenger side temp controls correct? Start with checking all your HVAC fuses behind the mid row seats. Then do an actuator reset (similar to what I do in this video but pull all fuses). If the actuator is dead it will not adjust. If the issue is wiring/temp gauge controls then the actuator may reset but not move when temp controls are adjusted. It would be helpful to have someone else turn on the cars power so you can listen for the passenger side actuator to see if it moves or not.

[@JacobDaniel-gz1th]

I wish I had watched this video before I tried it, gave up, and put the car back together. My TB has a big metal plate where you stuck your right hand through to put in the actuator. But if I had at least known where the durn thing was maybe I could have reached it.

[@Leolioness44]

LOL I'm installing the front blend motor actuator and I have constantly heard that clicking noise in the back, it's been going on and off for years. Sometimes it would stop for up to six months or more. Then it would come back to clicking always when I start the car and then it would go off. I did notice the back blowers blowing out hot air and couldn't understand why. LOL

[@leeguerrero228]

This video was extremely helpful!! Thanks for doing the video!!

[@brandyntherwanger5731]

Ok so my issue is on the other side. Passenger is stuck on hot. Do I need to dismantle passenger dash ?

[@harrydrrim5660]

Same problem with 02 trailblazer , cold air right, warm drivers side. Have no click sound but trying to reset Actuator before replacing. Your Video is very helpful. Thanks...

[@JuanGarcia-wy9ch]

I have a 2002 Chevy Trailblazer LS and I’m having an issue where I turn in the ac and and only air blows out from the defrost & floor vent. What is the name of the actuator do I need to replace?

[@michaelniceguy4042]

As I watch the video I didn't see you telling the audience that there's 2 7/16 bolts at 11 o'clock and 1 o'clock to remove

[@alexvarenyk1437]

Hi. I need your expertize. I have 2006 Trailblazer EXT 4.2L with AC/Heat blowing on floor and defrost. Have hot & cold air and can change the flow for floor only, for defrost only, for defrost and floor, so it works but face vent. The control panel is manual. The question is which actuator I have to change (did different calibrations, did not help or may be just me). Thank you.

[@savorwithdmurph1113]

Hello Alex, that sounds like your having issues with your driver side mode actuator. It’s up in the top area (I briefly show it’s location in this video) closest to the instrument panel. There’s another actuator next to it, closer to the engine, and that is defrost. The mode actuator directs air to the face or to the floor. Yours may be stuck on the floor setting. The good news is that it costs half as much as the temperature actuator and is easier to get to. I think I have a link to it in my description. I’ll send you a link later this evening to a diagram for location.

[@savorwithdmurph1113]

This is the mode actuator. It's #1 in the first picture. I really wish KZbin would let us share photos in comments. www.justanswer.com/chevy/3kcj9-simple-method-replacing-mode-door-actuator.html

[@alexvarenyk1437]

@@savorwithdmurph1113 Thank you for help.

[@thebigdr]

Just don't touch the HVAC controls after pulling the fuse or disconnecting the battery, for 45 seconds.

[@demarques1911]

Will recalibrating help with my air blowing backwards.... For example... My defroster is really my vent for the face... It's almost as if the system needs to turn around 180 DEGREES

[@savorwithdmurph1113]

I’m not sure if that will help but worth a try 👍 so is the A/C knob changing different vents than on the indicator?

[@rahrah8076]

Car Painter 19 if you have a good scan tool you would be able to see the blend door actuator counts which are numbers and it will show the vent flaps opening or closing or if they get stuck..you can also do a blend door calibration with a scan tool

[@demarques1911]

@@rahrah8076 just now seeing this. I just bought a Xtool machine. Will try it

[@arnoldogarcia2495]

Thank you man por video

[@patwatson9441]

My trailblazer is falling apart all of a sudden. Can you send me the specific information for all of the front actuators that I need? Haven't found anyone locally that seems to know. I have a guy that can install them but he is unsure of the specific parts I need to purchase.

[@AlexRamos-qw9jd]

I that is i good tip and i have cuestion i have 2002 trailblazer and the revers lihgt no work i rely want to no how kan i do

[@joshuam2140]

I'm replacing the same exact actuator on a 2008 Envoy Denali and had a very hard time getting it out. The metal reinforcement bracket that sits directly in front of the actuator on mine does not have the access hole to reach through to get to the actuator. I had to take it completely out. I see on yours and all the other videos I have seen on this the hole is there, not sure why this one on mine is solid. Thanks for the video, it helped me a lot.

[@alexkolesen3765]

My 2005 trailblazer has a solid piece of metal in front of it too. Really stupid design. Was trying to get to it today spend like 3 hours still no use. Probably gonna need to remove center console to get entire dash off.

[@karguy1720]

I had the same problem and had to take my car to my mechanic. I asked how he did it, and he told me that he had to drill an access hole through the bracket to remove the mounting screw.

[@michaelshannon6312]

@@karguy1720 Thanks, I thought it was just me. 2007 trailblazer have like an inner plate inside. thinking I'll drill out a hole though it as it seems theirs no easy way to pull this sleeve out.

[@michaelshannon6312]

Thanks, 2007 trailblazer same problem, someone suggested drilling and access hole though this center sieve that s blocking access,

[@jamiegilliam681]

Ur vid. And the other one did the easy one, do the very top one. Can't see the bolt at all. Im just pulling the the plug, and say the hell with it. Its been 2yrs. Already.

[@Fadaal]

Video was very interesting will have to get someone to do it I'm a older female

[@wild8757]

Need more light

[@philgarrison6065]

Would it have been easier to remove the front panel(stereo/climate control)?

[@realbighorn]

thank you very much for posting this video. It was very helpful.

[@eldonashbaugh493]

Next video please use a lazer pointer to show what bolts you are removing

[@scubab1866]

How can you see the accuator to know if thats the one thats bad? I cant see if its moving

[@JCT442]

Original owner of an '08 TB. Just replaced the driver blend door actuator. Thanks for the video as it really helped. The issue I had was that by '08, the geniuses at GM changed that heavy bracket you put your hand through to get the actuator top bolt. On mine, the bracket is solid so it must be removed. It took me about an hour to figure out how and then remove it. That bracket was the hardest part of the job. I didn't have to reset the actuator as it worked from the start and still works great. It's a shame GM made owner repairs so challenging due to interior dash designs that are ridiculous to work with.

[@countrygamer7280]

On my 04 envoy i kinda have a similar problem, my passenger blows full cold full hot but my drivers side blows full hot but when its on cold its not as cold as my passenger side

[@savorwithdmurph1113]

That sounds like the settings are reading full hot but only partial on the cold, very similar indeed. It sounds like the system may just need to be reset? If it’s not making any crazy noises try resetting the system with the fuse pulling. If that doesn’t work you might have to replace the part.

[@countrygamer7280]

DMurph & Pri-Pri thank you!! I will infact try that out right now

[@derrickpruett7893]

@@countrygamer7280 did you try this? I'm having the same issue with my 2004 envoy

[@pamelafick5142]

​@@savorwithdmurph1113 Thank you for this video, my 2004 Isuzu Ascender is doing the same as the others, there is a 15 degree difference between my passenger side and my driver side.

[@jasonbrown467]

@@pamelafick5142 i too have a 15 degree difference, my driver side is 15 degrees warmer than my passenger, but neither side are that cold. compressor works. i have 45 psi on the low and 260 on the high, on a 95 degree day in the sun with high humidity, and with the vehicle sitting still it only blows 78 degrees on the passenger and 85 on the diver. it also get colder but not much when i get driving down the road. my accumulator is warm and dry. i can only get the accumulator to get cold and start sweating if i over charge the system to 70/350. i have two trailblazers and my other trailblazer blows about 55 degrees sitting still and 45 degrees when driving down the road in 95 degree heat, and it gets to those temps quickly. i am hoping that what ever is going on with my driver side is causing a malfunction with both sides being warmer than they should be. pamela did you get yours figured out?

[@defaultdk5897]

Do you have a picture of the part you replaced ?

[@savorwithdmurph1113]

a picture of where it goes?

[@franciscomartinez3734]

I don't know what he replace

[@savorwithdmurph1113]

I replaced the driver side temperature actuator it controls if hot air or cold air blows out of the vents.

[@kevingaddis7276]

Thanks for the video, I think I can do it now .👍👍👍👍👍

[@savorwithdmurph1113]

Glad this video helped! I hope the repair went well!

[@Derick9772]

To bad that’s not air temp on the driver side

[@Bajaheat]

Why is yours still clicking

[@savorwithdmurph1113]

My rear actuators are causing the clicking noise. I talk about this a little after 25:00. Just posted a video about their repair. They all started going out at the same time, yikes!

[@corazondemelon8374]

Where is the actuator for the passenger side???

[@Aquatik1]

no very good video: technical?

[@ceciliavarner5462]

I'm a little late viewing this but I have an 06 and the front vents don't blow. But the dash and floor do. What would I need to change and where exactly is it?

[@pancho1682]

It’s the most upper top actuator for that problem. Each one has a dedicated function. Sometimes you can get away with just unplugging it and adjusting it. Afterwards it could start working, unless faulty. Unplugging the battery really throws these actuators off.

[@isaacbedwell4041]

Okay but howd you get it out..

[@bradb4620]

Any thoughts about some of the dash guages not working properly?

[@anthonysmith141]

It might be time to replace the instrument cluster

[@2268up]

Back breaking job, I've done it twice

[@savorwithdmurph1113]

I agree! Removing and installing is the hardest part. Getting there isn't too bad. Not sure if you read the guy's comment about how we're all idiots for removing our dash and how quickly he did the job. However, I don' t think he was working on the heat/cold actuator. Not very easy as you're well aware. Do you reset by pulling the fuses?

[@2268up]

@@savorwithdmurph1113 yes, everything is working fine now. I cut out the piece of plastic that's right in front of that metal brace that the actuator sits behind that made it alot easier to get too

[@2268up]

@@savorwithdmurph1113 I removed the hvac b fuse for 1 minute, then put it back in and let the air run for a minute and a half

[@neverbrokeagainmoneygangta7831]

im having the same problem

[@ellenprendergast9519]

My 02 GMC Envoy XL has a tapping when the AC is turned on. Originally I had no AC on the Drivers side but AC on the Passenger side and when using the Defrost I had the opposite, Defrost on the Drivers side but not on the Passenger side. Now my AC isn't working at all. It still tics and blows air only no Cold Air. Could troubleshooting which Actuator is out and replacing it possibly get my AC back or should I take it to the shop to have the AC tested. I live in Florida and while I can live without the AC I'd rather not when I have my grand kids in the vehicle. BTW, I found your video very helpful and inspiring. I try to do whatever work I can on my vehicle before I take it to my mechanic. Thanks for your help!

[@savorwithdmurph1113]

Since you had ticking and no cold on the driver side it could be the hot/cold blend actuator that went out. The ticking is the gear inside the actuator being stripped which eventually leads to failure. The way to test is give the car power (don't turn it on all the way) and move the driver temp control through the range a time or two. You should hear a soft whirring noise coming from the driver side as the actuator adjusts (this works for all other actuators as well). If there is no noise, adjusting your actuator isn't moving the vent fans. Since the passenger side isn't cold either that concerns me that you may have a double fail on hot/cold actuators (there is one on the passenger side as well) or that the cold isn't working anymore which is another troubleshooting procedure. Test those actuators and go from there.

[@TheShazteck]

@@savorwithdmurph1113 question nothing coming from the vents 2004 envoy , does that means the hot/ cold actuator is defective?

[@Amkinney71]

My 04 Trailblazer is blowing cold on the driver side and hot on the passenger side. Is the actuator for the passenger side located on the passenger side of the dash?

[@savorwithdmurph1113]

Yes I believe it’s directly opposite the driver side. Haven’t worked on that one before but seen it in diagrams.

[@Amkinney71]

DMurph & Pri-Pri Could you help with diagrams of the passenger side?

[@johnkozlowski7642]

The drivers side works fine.

[@savorwithdmurph1113]

I suspect the passenger hit/cold actuator may be out. Did you inspect the fuses?

[@johnkozlowski7642]

DMurph & Pri-Pri not yet and I will check it out.

[@joylesstiger]

Rip ear drums @ 9:18

[@timothygunckel7162]

Why make a simple function in the vehicle so complicated. I could see if you had the auto temp control, but if you are going to move sliders they may as well be hooked to cables. Make sure you double check the part numbers on those actuators

[@straighttothepoint2717]

Because chevy

[@timothygunckel7162]

@@straighttothepoint2717 you might as well include ford, and all the others. They are all fly by wire now

[@diyathomeagain6616]

How do you know which actuator to replace? I'm getting lukewarm air through the front vents, A/C only works in the rear. Which actuator is faulty?

[@savorwithdmurph1113]

With the key giving the car power but the engine off you can adjust the temperature dial and you’ll hear it move. You can also do a visual inspection if you take all the panels off. That sounds like your hot/cold actuators which is the lowest one on the drivers side. Is it just driver side or both sides?

[@zacherynagy8445]

@@savorwithdmurph1113 im having this issue with both front sides and rear. However I removed the 2 bolts that are 5.5 mm on the lowest one on driver side but it wont come off almost like there is another bolt. Any ideas?

[@davinaustx]

Saved me $250, couldn't have done it without the video. Thanks for part number as well!!!

[@roymartin5667]

Awesome info. Reset worked in my 04 Chevy Avalanche

[@savorwithdmurph1113]

Very good! A simple procedure that can fix some issues 👍

[@benjamincandelaria1093]

How much would this cost?

[@savorwithdmurph1113]

The part runs 45 to 80 dollars on rockauto. I've heard having a mechanic do it costs hundreds.

[@jacktrippa843]

Would this be the same for a 04 Isuzu ascender

[@savorwithdmurph1113]

It may be similar. Test before by adjusting the dial to see what actuators are moving. Isuzu is not mentioned in the hanes manual I use (envoy and trailblazer)

[@jacktrippa843]

I Kno but every time I try Google it. It pulls up those two trucks

[@rahrah8076]

Looks like you replaced the mode door actuator which is for the vents to move the flaps for floor or defrost or defrost and feet and the temperature one is for the hot and cold..maybe change the description so people don’t get confused

[@savorwithdmurph1113]

The actuator I replaced is most definitely driver side temp control. I felt it move as I adjusted temp control knob and have manually moved the mode actuator vent knob with my hand which is higher up.

[@rahrah8076]

DMurph & Pri-Pri on my truck there is only one mode door actuator on driver side which controls the vent flap and defrost flap then there is the temp door actuator is for the heat and cold which located under passenger air bag then there is recirculating door and that is in the same place on passenger side

[@savorwithdmurph1113]

You might not be driving a 2002 Trailblazer EXT LT. What car are you driving?

[@rahrah8076]

DMurph & Pri-Pri 2010 Chevy Silverado 4.8 way different lol

[@mrmoss190]

FAIL

[@annaf6648]

Thanks for the video! I’m going to attempt to do this myself instead of paying $400 plus dollars at Firestone!

[@savorwithdmurph1113]

Awesome! $400 is crazy and that’s why I post these videos lol! It’s not too tough of a job. Just be patient removing and installing the actuator and be sure you get the right part 😉 I did this once before with the wrong actuator and that was a pain!

[@annaf6648]

I sure will! Thanks 😃

[@jasonbrown467]

@@annaf6648 i got an estimate from the dealer and it was close to $1200 last summer to fix. i spent hours understanding this top to bottom , of course i since then have forgot most of it, but once i understood it and ordered the part...i had the new one installed in about 20 minutes. the dealer claims the entire dash must come out, funny how i figured out how to do it in 20 minutes and left the dash in, and i made zero modification to my system...no cutting or bending of anything etc etc.

[@angelf9800]

If you said you have 5 of them how do you know which one needs to be replaced

[@savorwithdmurph1113]

Thats a really good question Angel. This is a link to a decent process to diagnose which actuator is bad. You'll need a Haynes manual or something similar. www.familyhandyman.com/automotive/car-maintenance/car-heater-blowing-cold-air-check-the-actuator/ Then this site will show you diagrams of the air-conditioning area so you know which part number you'll need. www.wholesalegmpartsonline.com/showAssembly.aspx?ukey_assembly=437292&ukey_make=1024&ukey_model=14546&modelYear=2002&ukey_category=19390&ukey_trimLevel=25306

[@diyathomeagain6616]

@@savorwithdmurph1113 Thanks for posting this very useful video. My 2002 Trailblazer blows "room temperature" air through the front, but the rear A/C works fine. Heated air does work through all air vents. It's a manual dual climate system. I do hear clicking every so often from under the driver side dashboard. I have NO IDEA which of the 3 actuators to replace. I wonder if you can make a troubleshooting video - Chilton's says this is beyond the scope of the manual.

[@edwardrtt]

what is the ticking noise, mine does the same

[@savorwithdmurph1113]

That is an actuator starting to wear out. The actuator begins to lose track of when to stop rotating and the motor continues working when the gear attached to your AC vent can’t move anymore. So the gear teeth inside the actuator skip or break causing the clicking.

[@robanderson4137]

There are several plastic gears inside the actuators. The main drive gear tends to split causing a gap in the teeth. The clicking sound is the gear slipping where it meets up with the split in the gear.

[@katrinafurr-bradley1714]

Do you change one on a Oldsmobile Bravada the same way?

[@rahrah8076]

katrina furr-bradley they should all be similar

[@TheShazteck]

Which one of the actuators is for the vent control ? No air coming from the vent! Thank you

[@kingnasty5381]

What does each hvac actuator do??