1996 GMC Sierra 6 cyl Four Wheel Drive Automatic 199000 miles
I have a 1996 GMC Sierra. When I turn on the Air Conditioning or the Heater you can not change the temperature from hot to cold and it will not blow out of the vents. It only blows from up top and it's hot air. When you push in the buttons for the A/C they do not light up. The only thing that works is changing it from low to high. I bought a new A/C and Heater control panel switch. That did not work.