A/c blowing hot warm air

Good luck with that man it's over my head.

check all your fuses. g/f's dad f-250 had more fuses than i thought for an a/c. but then again gm may be different. his was blowing warm and we could hit the dash and it would blow cold again for a little while. but then again it very well could be that switch, when my dad gets home i'll ask him or run next door and ask my neighbor (mechanic)

Sounds like its that switch. Unscrew it, take it to the auto parts store and get a new one, then screw the new one on. There is a valve in there to keep the refridgerant in when you take it off.

when i was working on my cd player i accidentally tugged a wire out of the back and for some reason it blew hot air, i think i yanked the temp wire and it wouldnt change.

thanks for the info guys

mine is acting up too. at first, i would have the thermostat knob on cold and it would blow hot. now it will only blow cold, no matter what temp. setting I have the know on.

Re: A/c blowing warm air

03rado said:

I think it is the switch on the side of accumalator (sp), I wiggled it and the a/c started blowing cold anyone know what the name of this switch is called and how hard is it to change

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There is a low pressure switch that keeps the compressor from coming on if the freon levels are too low and it would burn up, maybe this is the switch that you are having trouble with.

chevyman992002 said:

mine is acting up too. at first, i would have the thermostat knob on cold and it would blow hot. now it will only blow cold, no matter what temp. setting I have the know on.

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I'm not positve on our trucks, but on most cars the temperature knob usually is vacumm operated and controls a flapper where the blower fan is that opens or closes a flapper that lets either the cold air or hot air through .. sounds like that may be the case with you, that it's gone out. If anyone on here has ever removed the A/C controls they might know what kind of connections are on teh back.

Just be glad it's stuck in the cold position for now :read:

:crazy:

when the heater is on mine blows hot, when the a/c is on it blows warm until I wiggled the switch on the side of the accumalator (sp), it started blowing cold air again