problem with ac climate control need some help..
 

search but no luck. when climate control is all the way on cold blows cold air but only one click down and blows hot air i try the ac calibration and still the same, anybody has any clue what it could be any input would be apreciated thanks.

forgot to say: hummer h3 2006

Check resistor
 

Is it possible that the resistor has partially blown? My AC cut out this summer and to fix it I need a new relay and resistor. Both were easily installed within two hours with no help needed.

i will check those parts but te ac and heat are working but when i try to lower the temp from the cooldest to hot just clicking one towards the heat start blowing really hot air .

Same problem
 

I have the same issue. It's happen in the past as well. Last time I fixed it, or so I thought, I had a vacuum line unplugged. this could have been a total coincidence. Also, this problem started after I disconnected battery. The recalibration trick doesn't work for me.

Any luck???? :confused:

when you turn it down and it starts blowing warm air is the ac pump clutch disengaging? if it is still running it sounds like it'd be something under the dash or the switch opening and closing the duct work improperly

What occurs is, I have the AC control on coldest setting. Once I move it one click warmer, it stays cold for about 10 seconds, then starts blowing full heat. I believe its a problem with the blend door actuator. This seems to be a common occurrence whenever the battery is disconnected and reconnected.

Thats exactly what hapening with mine and i disconnect my battery too try calibration and still the same ......m#$#% F$%$%)*annoying but i will find what it is wrong and posted so every one can fix it or if somone find the problem please share with us thanks... lol

Be sure to post your findings!

I will wont be anytime soon cause ill be on vacation when come back I will fix it and post whatever was wrong.