Removing the fuse for a few minutes and turning the controls on both driver side and passenger side to the highest setting and then turning them down slowly until the system started cooling has worked for me. Thanks for the suggestions---saved me $2500.00 on a useless dealer estimate to fix problem. These dealers are dangerous---they were the ones that caused my problem when they unhooked the battery while replacing my ignition switch.
I would try resetting both sides. i.e., Set both sides to hot, then back down to cool. Also check your fuse. I am not sure, but would think, you have a fuse for all these different items. It is time consumming, but look through and find your blown fuse. Hope it helps.
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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.
I have had this problem. I am not a mechanic...so to correct the issue temporarily, I simply turn off the car and restart. This has worked everytime for me. In extreme cases, I think you can also remove the AC fuse and start the car, which will also reset the computer. I also think that by taking the climate control off the "AUTO" setting has worked in the past.
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.
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.
Turn your AC off.
Turn the car off
Crank the car
turn ac on drivers side to 60
passenger side to 90
wait 1 minute
turn AC off (very important)
turn car off
turn car back on
switch driver's side 90 passenger 60
wait one minute
turn AC off( very important)
turn car off
turn car on
AC 70 both sides
your ac should be blowing cold
If not, you have an expensive problem