I have a 1990 chevrolet 1500 silverado w/ a 350. I am wondering what the problem is with my A/C. When I turn the truck on the air condition is blowing hot air, but my control module wont let me press any of the buttons. When i press the buttons to make is hot or cold, A/C or vent it does nothing. I know that it does have freon and it worked last week, The fuse is good. If anybody knows what could be the matter. Trying to sell the truck but the value is crap without A/C in Texas.
Tanner