I have a 2004 Chevy Suburban with both front and rear AC. Today, the front stopped blowing cold air and blew hot air while the rear continuted to blow cold air. The controls were all set to AC, but the air coming out of the front vents was HOT.
Just before this happened, I replaced the Battery as the origional unit would not take a charge.
I checked the AC related Fuses in the driver side panel, but they seemed ok.
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New to the forum here. I searched for this specific problem due to my 2005 Z71 Suburban blowing hot air on hte passenger side periodically. Doesn't do it all the time just every once in awhile. I have not changed the battery or removed it. Was hoping to see a response to your question as well.
Just got an answer from Chevy Dealer. When you replaced the battery it loses its memory as to where the door actuators were (the flaps that control the heat and A/C).
Turn everything off and let the car sit overnight. The computer should reset itself during its learnings process.
In the morning turn on the ignition and let the car run for a few minutes before turning on the climate control.
If this doesn't work, plan on 1-1.5hours of labor for a technician to reset the actuators at the dealership.
Same thing happened to me although not sure if it first happened before or after I changed the battery. Also, sometimes the rear air will blow hot when the front is fine. It's wierd. :-) I have found that turning the vehicle off & letting it sit for a few minutes TYPICALLY resets the compute & fixes the problem.
Place the ignition switch to the OFF position.
fficeffice" />>Remove the HVAC/ECAS fuse (which is located in the fuse box under the hood) for a minimum of 10 seconds. >>
Install the HVAC/ECAS fuse. >>
Start the vehicle. >>
Wait 40 seconds for the HVAC control module to self-calibrate. Do not adjust the A/C controls until after 40 second or so.
At first the air was very hot then it went to cold and all was well again. Good luck. >>
Well, that fix I posted only lasted 2 days. So I found the actuator on the passengers side, where the air vent is and removed the 2 screw closest to the passenger door and pulled down the plastic cover to expose the actuator thats causing this issue, then turned on the A/C (mine starts up cold then turns hot) so when it was cold I disconnected the wiring hardness before it switched to hot. This has lasted me 2 weeks so far until I can figure out my next move.