Got an 81 and the ac just stopped working about a month ago. If I try to switch it on, two fuses blow on the panel, 1 for the heat, 1 for the ac. I replaced the left hand side switch on the control panel but it didn't fix it. I'm pretty sure the compressor is still working because before the fuses started blowing everything was cold... just no air was blowing out of the vents. Need some clues as to what I might check next (and where that part might be located on the truck). I'm not that good at finding things on my own, haha. Thanks.