A/C blows hot air

chris_kucia · October 1, 2004

Now that the weather's changing, I have to run the defroster in the morning.

I typically leave the A/C button on, flip over to defrost, and turn up both the fan and the heat (I have the standard controls, not climate control).

Anyhow, once things have warmed up, and I flip back to the standard vents and set the temp down, the air flow changes, but the heat doesn't - its still very hot.

If I shut down the truck and restart it, the air blows cold again.

If I just start it without turning the heat up, air blows cold and I can adjust it at will.

I couldn't find anything in the archives. My guess is that the controller for the heater/A/C door is acting up.

Anyone experienced this or have any ideas how I might troubleshoot it?

poorboy · October 1, 2004

I know what you mean...mine just started doing it as well. When I turn the a/c on it blows hot and I either have to turn it off and back on or cycle to defrost to get cold air going. Not sure what it is but I do remember reading something on this topic a while back. Someone will know what is causing it.

XTOAK · October 1, 2004

My service advisor said they couldn't find anything wrong, and that the "pc reboot" method of pulling to the side of the road, turning off the truck and then restarting it is the best way to solve the problem!!!

Great!! Now Bill Gates must own a huge chunk of GM shares!!

eaa1964 · October 3, 2004

any luck on this topic? my dealer has ripped my dash out of the car and has had it for 2 weeks. initially they said it was a mode door actuator problem and a simple fix. obviously they either boke something and don't want to fess up or who knows what. dealer will not tell me what the problem is...simply were need more parts. I have phots of dissasembly. not pretty. taking any advice on this.

e.antos

BishopZ71 · October 3, 2004

My truck did it once a couple of months ago. I just kept driving the truck. About 30 minutes later it started putting out cold air. I tried resarting my truck, but it dind't work.