Hoping someone could help me out. I have an 1988 chevy truck. Last week I started the truck to let it warm up, after 20 mins idling in the driveway I noticed the windows were still frosted up. I got in the truck to find the climate control box blacked out but the button lights on. So assuming that it was no longer any good I had a replacement one shipped. When I plugged in the new one I noticed the same problem. However the lights on the buttons still light up. Just the screen is black and have no functions. I've checked fuses and have had no luck. It'* cold up here in Canada and would like this problem solved. I'm sure someone out there has encountered the same or similar problem. Any suggestions would be appreciated. Thanks