Question about 2002 GMC Envoy

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I have a 2002 4-door Envoy extended length. Three years ago the rear HVAC stopped working; 6 months ago the left rear electric window stopped working; yesterday the right rear electric window stopped working. Is there a common link here?

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I doubt there is a common cause. The rear HVAC needs to be diagnosed by a HVAC technician. The electric windows problem is probably a bad motor in the door. Do the rear windows work from the driver's controls? If they do, then it is the window switch that is faulty.

Posted on Sep 26, 2010

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Aug 25, 2011 | 2002 GMC Envoy XL

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I got a new battery put in my envoy, and now the heater only blows out the defrost and stays on hot, it won't let me regulate the temp or where the air comes out. please help. and my auto start will not...


Hi, please try a recalibration of the system as follows:
  1. Remove the HVAC B fuse (in the rear fuse block) for a minimum of 10 seconds.
  2. Install the HVAC B fuse.
  3. Start the vehicle.
  4. Wait 40 seconds for the HVAC control module to self-calibrate.
If this doesn't work, please get back to me.

Apr 10, 2011 | 2002 GMC Envoy

1 Answer

Driver side back window won't stay up. Got wedges in it now to keep it from going down. I can hear the window motor running so must have a gear or some such thing broke. How do I get the door cover off?


You likely have a bad window regulator(fancy name for the electric motor and the cable mechinism that moves the window up and down.

I have had to replace both rear window requlators in my 2003 GMC Envoy, Terrible engineering on the window requlator. There is a nylon wheel on the electric motor, that nylon wheel winds up the cables to raise/lower the window. The edges of the nylon wheel (drum) wear out and the cable derails. Running the window motor just makes a "rats nest" out of the cables, you will likely have to replace the whole regulator. The inside door panel is held on by screws, in door handle and then clips around the perimeter of the pannel. After you remove the inside door panel there will be a paper panel siliconed to the door frame. You will have to be very careful removing it as it tears easily. I replaced my requlators several years ago. The left and right door went out within a couple of months of each other. At that time the only place you could get the rear doors was the dealer($200- $230) . The front doors had aftermarket available. I would assume with such a poor design, there are sure to be less expensive aftermarket parts(that are likely better) available.

If you are mechanicaly inclined, should be able to replace in about 1-2 hours.

Jan 18, 2011 | 2003 GMC Envoy

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2002 TRAILBLAZER no rear heat. Rear fan works only blows out of lower vents. Will not switch to upper vents even on AC. Have heard clicking sounds from somewhere in the rear. Radiator is full. This...


Hello! One of the Blend Door Actuators is defective...There are three different Actuators...See picture #1...I would suggest that The Mode Door Actuator is defective...It is DORMAN Part # 604115...Cost = around $50..It is on the lower left side of the pictured HVAC unit....The part is shown in picture #2....After replacing The actuator...Pull the heater fuse...Start the engine...Run for 45 seconds...Turn off key...Replace fuse...This allows the computer to learn the new part...Guru...saailer




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1 Answer

2006 GMC Envoy I6 HVAC fan stopped working. Level 5 stopped about 6-months ago and now it doesn't work at all. I checked all fuses and the cooling fan relay but still not working.


If high speed went out first, then it is the switch.
There is the most arcing in the switch at high speed.
If there was motor or relay trouble, it would effect all speeds.
If there were problems with the ballast resistor, it would effect lower speeds.

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