just went and di this twice. its gotta be the blower module piece.

when i would plug it back in and start truck it would say... auto, 74 degrees, slowly start counting up the notches for blower speed, then be on feet then switch to face vents and thats it.

either way my compressor clicks on and it doesnt blow anything out.

 

Yeah, mine did the same with the auto 74*. It never blew through the defrost first but after a few times, I was able to get it to blow through the vents, so i then powered it off. I really wanted the digital HVAC in the truck when I was looking. Now im pissed off that I wanted it initially...haha!

 

So before you got it to do it nothing would
Come out of vents at all?

And each time you disconnected the Ac controls?

 

before doing this, when HVAC was set to blow out of the vents, it would also blow down towards the floor as well. after disconnecting the HVAC and attempting the "relearn" a couple of different times, i finally got it to blow out of the vent only when i had vents selected.

 

Hi I have an 04 yukon and just replaced the blower motor resistor to fix the HVAC blower only working on certain levels (3-5 only) now...

NEW PROBLEM---When I put my passenger side HVAC temp slider to medium cold (or even like 90% cold) it blows hot air......but if i put it to max cold it blows cold air....The drives side is fine....is this the same issue?

Also if i have to unplug the HVAC controller where/what is that?