Replacing Rear AC Blend Door Actuators Chevy Trailblazer 2002 EXT LT Hot/Cold & Head/Feet

Is your rear AC not getting hot or cold and making clicking noises? Are there issues with switching the direction the air blows? You may need to replace your blend door actuators in your chevy trailblazer / gmc envoy. I also show you how to reset the HVAC AC system with fuses so everything works properly. Let me know if you have any questions!
Actuators ACDelco 15-72811 aka GM 88892975 --- amzn.to/2KO5Fsc
The equipment I use to make videos:
(Camera) Cannon Vixia HF R700 --- amzn.to/2FSoBTn
(Microphone) Rode VideoMic --- amzn.to/2XcNOSa
Watch this video to learn how to remove the rear ac trim panel.
• Removing Rear AC Trim ...

[@jodyseaman1885]

Thank you, just bought a used trailblazer and it started making that clicking noise, so happy it's something I can fix myself.

[@andylimb]

Thank you! - Dhanyawaad! I just ordered my actuators after finding your video. It’s getting too hot in Houston to not have proper AC flow in the rear.

[@garrettthompson2595]

Adding the part numbers to your video was extremely helpful thank you

[@savorwithdmurph1113]

Glad to hear it! I was trying to make it a bit easier on you guys.

[@joshweinstein5843]

@@savorwithdmurph1113 For the reset on the Actuators, should you give the car longer than 2 mins on the "ON" position with the key? Seems like 2 mins isn't long enough to cycle the actuators.

[@PaulTackitt82]

Aaron from The Walking Dead shows us how to fix annoying problems like this! Great video. I'll be working on this soon, as my upper vents are not pushing any air. Lower ones are fine but are only blowing cold. Thanks again.

[@rodeogalzoe3226]

Awesome video! Thank you so much!!!

[@abderrazekelkhaldi1]

Very helpful thanks

[@rudgarza9564]

Thanks brother

[@brendahatfield3098]

Thank you

[@rhythm449]

THANKS,, GREAT JOB...

[@whiggins101]

Thank you so much! I've been looking for those part numbers for 1/2 hour. It would be helpful if GM would print the part number on the device, but that would be too easy. LOL

[@larrybg]

Thank you! You saved so much time for me! But I got sloppy and broke the knob/pin of the hot and cold actuator when I was removing it… yeah, bad situation. I have tried to figure out how to remove it but no luck. Any idea how to remove and replace that pin and what the part number I have to look for?

[@pedroclemente7467]

So I need to remove the fuse while the car is on or off? And how long do I leave it running? I didn’t get that last part my bad

[@MLuke1989]

Thanks for the video! When your actuators were bad was your rear blower running at all or will bad actuators keep it from running period. Thanks!

[@savorwithdmurph1113]

Bad actuators won’t keep your blower from running. It could be a fuse or there may be something with the motor itself? Is it your front or rear blower motor?

[@AHLive215]

Mine just started doing it when i disconnected the battery. Is this common when disconnecting the battery

[@TEBCO123]

hi, is there a fuse I can remove. my actuator closest to the rear bumper is clicking. i just want to stop the noise without taking panel off.

[@silbinocardozo630]

Hey, awesome video!!! So after two years of procrastinating I finally opened it up. Now I have the replacement parts but the position isn’t correct inside the actuator. The ones I removed are a certain way. How can I fix that?

[@savorwithdmurph1113]

You can move the vent knob and then slide the actuator on. This is difficult for the hot/cold one on the side but possible. You can also plug the actuators in, reset the system and adjust the rear AC controls till they fit.

[@silbinocardozo630]

DMurph & Pri-Pri hey so I managed to get it to work. I plugged in the actuator and noticed the position move when I moved the knobs around of where I wanted the air to blow. I got it to move to the middle, and using a flat head screw driver I moved the knob to the matching position and managed to get it in.

[@LeviLippincott]

So working on a 2004 GMC Envoy with these same actuators and the same fuse schematic. When I pull the fuse to reset after plugging it back in it will sit there quietly for about a min or two before it does anything, then if I kill the vehicle and bring it back on nothing happens. It will also kill the fan as well. If I leave it on for about 5 min the actuator controlling the temp will make noise like it is calibrating but the floor/ceiling actuator does nothing, then the fan will kick on but the actuators are still unresponsive. Is this something we should see results right away or it is something that really needs several days like you mentioned? Or could it be something else?

[@joshweinstein5843]

Did you ever find a solution for this reset issue? I'm having the same challenge with my 2005 Chevy Trailblazer.

[@photojock3398]

I don't have HVAC fuse in my cluster only 1 A/C. And it doesn't seem to do anything. Also, I couldn't just swap the old for the new as the plugs were not matched up so I could install them. Were your yours matching up for a quick plug-n-play? Currently I have all my car apart old actuators off and no way to put the new ones in...HELP!

[@savorwithdmurph1113]

What year is your trailblazer? Also check your cars manual for the location of fuses or google the relays. Yes mine were matching up for a quick plug and play.

[@chrisroberts8272]

Is their a email that we can get in contact with you for questions on the TB?

[@ramonesmith8777]

Which front actuator on a 2006 Chevy trailblazer controls the blend doors? And are all three the same in the front?

[@savorwithdmurph1113]

So it looks like the 2006 may have the same location for blend door actuators. The Hanes manual has years 2002- 2009 so I would assume these are all similar locations. Mine's a 2002. The one I worked on controls the hot/cold driver side.

[@ramonesmith8777]

@@savorwithdmurph1113 are they all the same part?

[@charleswhitmill8116]

Do you have a video on how to take the left rear panel wall out and put it back?

[@savorwithdmurph1113]

No but I have a video of taking off the right panel. It is pretty similar to the right side. I had to replace my amp so I did the left side recently. You undo 5 screws in the back. Take off the seat belt, use a panel pry bar to pop off the seat belt trim panel, then use the pry bar to pop off the left trim panel. It also would probably help to remove the small left rear trim panel above the left trim pane in the rear because those two are hooked together. There is one electrical attachment to a power outlet that's a little bit of a pain but after that the panel is off.

[@charleswhitmill8116]

@@savorwithdmurph1113 my bad it is the right panel

[@ethananderson4447]

Does the gmc envoy use the same ac/heat actuators because I'm having the same problem

[@user-cy6gf2pj7y]

yes

[@Hugh_Manitee]

Does the same part number fit a 2005 Trailblazer EX LT?

[@savorwithdmurph1113]

I think it does but always verify.

[@Backdoe_taz]

I have a 05 Chevy ext and my ac works fine for the front but in the 2nd and 3rd row they only blow to the feet

[@MariaGarcia-so6em]

My rear ac/heat dont go to cool it stays watm is this the same thing to fix that?

[@user-cy6gf2pj7y]

yes, the first part he changed in the video can cause your issue

[@kg7yts187]

Why do these things mess up when you disconnect the battery

[@robertl955]

I see everyone say this actuator fixed all their problems but I cannot find my specific issue. Top air vents in the rear do not work, floor vents work no matter the position they are set to. They only blow warm/room temp air no matter how they are set. I searched all over reddit and apparently, every trailblazer is having some variation of this issue.

[@dngdong1876]

I can't afford to fix it yet and it's draining my battery...is there a fuse I can pull to stop the motor or whatever that is from continually trying to engage??

[@savorwithdmurph1113]

Not sure exactly what fuse to pull but there are several HVAC fuses in the back. HVAC B is for reseting the actuators. Try those and see what happens. I'm also dealing with a battery drain. I'll probably be buying a car at the end of 2020.

[@dngdong1876]

@@savorwithdmurph1113 thank you for replying... So I pulled that fuse all together and no more noise and now my car starts! Something is still slightly drawing power from the battery but at least it's driveable now

[@kevinhickey3946]

You don't have to have the truck off or the battery disconnected when removing the fuse in the fuse box for the actuators do you?

[@heatherclegg-chavez1255]

Hi, what happens if the vent control broke off in the actuator?

[@heatherclegg-chavez1255]

Also the air doesn't blow from the middle vents but it does from the very back??

[@savorwithdmurph1113]

So if the vent control broke off, you can try gluing it back on with strong glue or (I assume) replacing the blend door entirely. I couldn't find the blend door part by itself. This is a link to the entire assembly which includes the two blend doors. If you buy this make sure it fits your make and model. www.wholesalegmpartsonline.com/products/Chevrolet/2002/TRAILBLAZER--Base/CASE-AIR-CONDITIONING-AC-Evaporator-Core-Housing/3106047/89023340.html You might be able to find the blend doors by themselves if you look around enough. The lower blend door in the diagram is for temperature and the higher one controls air flow to the floor or face.

[@savorwithdmurph1113]

This is a common issue with the trailblazers. Try closing/adjusting the rear vents accordingly. I just had this issue, and I closed the rear vents entirely. I assume the AC was accidentally designed so more air goes to the back than middle.

[@edwardocollazo3216]

How do I fix the broken piece that the actuator slides onto ?

[@itsallhappening7172]

I found the same problem on mine....looks like someone tried to rig a lot in the back of mine, spliced wires and everything.

[@edwardocollazo3216]

I’m gonna try the junk yard to take out the whole unit to see if I can get the piece 🤷🏽‍♂️

[@jamesmaple8614]

Can you just disconnect the battery

[@JoeDetroit313]

I have a 2008 Trailblazer LT my front driver side does not blow as cold as the passenger side. Then with 15-20 mins of driving all vents start to blow warm air. I have to turn the truck off then on for it to blow cold again. Can u help me figure this out

[@savorwithdmurph1113]

Happy to help. I’ll ask you a few questions and we can get to the cause. First, this doesn’t sound like an actuator problem. A HVAC fuse reset will help rule this out. That driver side vent is acting a little funny but that wouldn’t cause all vents to go hot. Also if it was an actuator it wouldn’t reset every time you turn the car on. The actuators mainly reset when HVAC fuses are pulled/battery is removed. Second, have you had the refrigerant levels checked/serviced? It sounds like not enough refrigerant is getting around to keep the system cool. Once the car runs it may get used up and turning it off allows the refrigerant to gather, causing this cycle to be repeated. How long has it been blowing cold then switching to hot?

[@savorwithdmurph1113]

If anyone else has input feel free to chime in! 👍

[@JoeDetroit313]

Yeah the front driver side blows cool and passenger side blows ice cold. I had Freon put in last summer. Idk about the refrigerants or levels. How do I reset the fuse step by step I don't wanna mess this up. Thanks

[@JoeDetroit313]

Like 20mins of driving the air will blow warm u can smell the air change from cold to hot. I turn the car off then back on everything blows cold again

[@savorwithdmurph1113]

This is the process I followed to reset my A/C actuators. 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

[@yahiyahagos7775]

My dear my trailblazer rear AC is dead no any electricity work on it and when turn on is work so what I do ? Better I change the full fan system and really cost

[@savorwithdmurph1113]

Can you describe what’s happening in more detail?

[@yahiyahagos7775]

Hi again I provided to many work shop the some of they inform me to change to fan and some they said change the hole unit AC so with your help video I bought used part for the bowler motor resistor and work eventually but again go to off when I switch the AC so if I took out and return it back the resistor it’s work again today I will get other device and feedback thanks allot

[@yahiyahagos7775]

I did the replacement of the device and finally work thanks my dear I appreciate your advice

[@thatrandomguy8567]

Amazon says the actuator wont fit a trailblazer or an envoy?

[@user-cy6gf2pj7y]

yes, and a certain isuzu, and a certain saab, and a certain buick suv as well

[@carla5035]

Where is the video to remove the cover

[@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..

[@user-cy6gf2pj7y]

yes

[@richardhodges7228]

When I pull the fuse, my a c. don't work at all!!

[@user-tf5mn8iz2q]

help !!!! the peen who goes to the actuator is broken. can you help me ?

[@savorwithdmurph1113]

Hey buddy, can you please add more detail about what the peen is and the issue your having? I'm unfamiliar with the term peen?

[@user-tf5mn8iz2q]

@@savorwithdmurph1113 thanks, its the peen who goes in to the actuator, rear ac trailblazer 2006. the peen that the actuator have to speen...

[@user-tf5mn8iz2q]

@@savorwithdmurph1113 the hot/cold one...

[@user-tf5mn8iz2q]

@@savorwithdmurph1113 the one you speen at this video at 2:37

[@savorwithdmurph1113]

So the peen is attached to a blend door. You can try gluing it back on with strong glue or (I assume) replacing the blend door entirely. I couldn't find the blend door part by itself. This is a link to the entire assembly which includes the two blend doors. If you buy this make sure it fits your make and model. www.wholesalegmpartsonline.com/products/Chevrolet/2002/TRAILBLAZER--Base/CASE-AIR-CONDITIONING-AC-Evaporator-Core-Housing/3106047/89023340.html You might be able to find the blend doors by themselves if you look around enough. The blend door you need is the lower one in the diagram (temperature). The higher one controls air flow to the floor or face.

[@timothywaters6869]

Helllo

[@savorwithdmurph1113]

Heyo Timothy!