i have an 07 4.3l gmc envoy and the electronic climate control only lights up here and there and the issue is whatever the thing was set to last is what it will blow i had it set to full blast defrost since its cold in michigan but now that its warming up it doesnt seem to want to light up and when the display isnt on none of the buttons work is this some kind of ground issue maybe or can the unit go bad just wondering have a happy holiday

also ive noticed it will light up below 60ish degrees if that helps