A/C won't stay blowing
My A/C comes on, but only stays blowing to your face for a few seconds, and then automatically shifts to your defrosters. You can punch the buttons and redirect to your face, but again, after a short time it will redirect to defrost again. This don't help when the heat is high.
This is a dual control panel. Electrical, not vacuum.
so it's a burned out servo-motor....who would have guessed~ got to find that little bugger and replace 'im~
Looking for a Used Sierra 2500HD in your area?
CarGurus has 13,588 nationwide Sierra 2500HD listings starting at $3,450.
Search GMC Sierra 2500HD Questions
GMC Sierra 2500HD Experts