Dont ware the compyoter it salf programing jast kep a/c on ader wayes swetich of the car and pull out the kye and start the car agayn if stell the praplm jast keep on it salf it wellcame normaly
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First try this reset procedure .Set A/C panel to what ever setting you want just as long as the system is set to be on. Dissconnect the negitive battery terminal for 20 minutes .... hook the battery back up ... start the truck back up and do not touch any buttons ... the A/C should start going threw it test switching from defrost to vent to floor .This may take 5 minutes or so when its done shut the truck off then start it back up and move your setting to try out the system .if it all works right the module just lost its memory and you are all done if it doesn't then you have a bad Upper vent accuator that needs to be replaced
Hi Jeff. I had the same problem, along with others on my 03 Denali. Along with not blowing hot air from the rear heating system, I had hot air blowing out of the passenger side and cold air out of the drivers' side vents. My battery would go low and had the same smell. I took my Denali in to the dealer and they found it was a bad Fan Control Module. They replace it and everything worked well after. It cost me $293 for parts and labor. Hope this helps.
need to go to dealer to have HVAC module reprogramed. whenever diconnecting battery power on these vehicles you can connect a 9 volt battery between neg and pos to keep the memory in the computers. I am an master ase technician and 5 classes from gm world class tech.
You can do on of two things to see if it will reset the hvac system. Remove the negative battery cable wait two minutes then reconnect. This may reset the hvac. If not you can turn your switch on, but don't start it. Pull the shift lever down to 1st gear tilt the steering wheel all the way down. Now start pulling toward you with the trim on the dash to remove the trim. When it is removed, you can remove the Hvac controller. Once you remove it disonnect the wires wait two minutes and reinstall. This should get you cooling.
My wife had same problem in 2005 yukon. Turn both temperture controls on dash all the way as warm as they will go, Wait about 1 or 2 mins and turn back to coolest setting. Cleared our problem right up. Do this with car running and air on.