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

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

@@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.

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?

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.

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.

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.

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

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.

@@savorwithdmurph1113 my bad it is the right panel

yes

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.

@@savorwithdmurph1113 are they all the same part?

I think it does but always verify.

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

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.

@@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

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

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

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

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.

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.

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

Can you describe what’s happening in more detail?

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

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

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?

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

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

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

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. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Uf47Gz2whF0.html

yes

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?

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

@@savorwithdmurph1113 the hot/cold one...

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

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.

Heyo Timothy!