I just purchased on 06 sierra duramax and found that my a/c blows ice cold all the time no matter what I have the temperature set at. Only when I turn the heat to the max (32F) does it blow hot. There is no in between at 31F, 30F, etc. it is cold. Please help. Thanks.

 

it does this out 1 side,or both?

 

It does it out of both sides. The truck also has dual climate controls if that matters.

 

those are a mess to diagnose..a search here will show many such complaints..it's going to have to be scanned by a dealer or competent indy for codes.

 

Thanks for theinfo. I'll look into it.

 

no problem...as i said...there are many different reasons why those do that..not just 1 go-to answer...

an autozone type check only checks the main pooter for codes(pcm)...a dealer or up-to-date indy needs to check the hvac module for codes.