climate control

[cowboybobb693]

Good morning. My vehicle is a 2011 GMC Sierra WT. When my truck is cold, all of the climate controls work as they should..IE.. heat/A/C engage, all of the positions vents, floor, defroster work as they should, HOWEVER when the truck warms up the temp control stops working, and the positions no longer work.

I'm stumped, I really don't want to throw parts at this thing, but, I'm ASSUMING that the control (with the buttons etc..) is bad.. Correct assumption??

[tlaw91]

Does anything work when it’s warmed up or is it just temp and door position


Sent from my iPhone using Tapatalk

[cowboybobb693]

The fan works, the A/C works. It's become intermittent, I noticed today while driving everything worked, I could cycle between floor, defroster, vents etc...and the heat would work as well as the A/c... Just like normal. Then it just stopped having all of the functions and went back to blowing through the vents, but, no heat..

[cowboybobb693]

Anyone have any ideas.. This morning everything worked fine, until the truck got to full operating temp, then, vent doors would not change position, A/C comp would still kick on, fans work, no heat. As an after thought, about two weeks ago, while sitting in traffic, the truck got up to about 240, I switched over the heater to blow the hot air out, dropped the temp, but that is the only  "overheating" I've experienced

[tlaw91]

Sounds like a head unit


Sent from my iPhone using Tapatalk

[cowboybobb693]

 Thank you for the response..

Head unit? as in the controller, the part that is in the dash? Will that have to be programmed once i install it?? Or is it a plug and play?