Question about 2004 GMC Envoy
My 2004 envoy ac is blowing cold air up front, but hot air from the rear vents. Whats up? and my front "controls" for the rear air is not working properly. Please help!!!
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Posted on Jan 02, 2017
I have just ordered the part to fix this. It is the A/C vacuum actuator (not sure why they call it a vacuum actuator because it is an electric actuator). It is under the dash on the driver's side close to the radio. There are two in the same area. It is the one closest to the floor. You can verify by taking it out (pull out duct that runs from center of vehicle to the outside to get better access), and actuating the vent by hand with the blower on to see if you now get air out the middle vents.
The part number is 1573596 from Rock Auto on the net. It cost $40.79.
Posted on Jun 07, 2009
you need to change drivers side temp door actuator then disconnect battery for 5 seconds and reconnect after changing the part, turn key on for 60 seconds with touching heater control to allow actuator to program and then it will work.
Posted on Sep 19, 2009
try cheking the heater hoses located on the fire wall there are two of them if they are hard then they need to be replaced if they are soft then they are good. also chek the heater core
Posted on Mar 14, 2011
If you recently had a weak battery or replaced a battery the HVAC unit will perform a recalibration of all doors. This causes the door motors to be moved full cycle and the mode door will stick some times. Usually this is the problem. The actuator motor will need to be removed and replaced...sometimes they can be recalibrated, but not often.
Good luck, i hope this helps.
Posted on Jul 19, 2011
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