Ok i have a 1990 chevy k 1500 stepside regular cab 350 v8 the heater / ac control unit inside the truck its the push buttom lcd display kind it lights up but nothing happens when you press any buttons just the buttons light up on it it doesnt display anything can anyone help me wit this i checked and cleaned the plug behind the unit and tried replacing the unit i picked up two used ones out of the same kind of truck and they do the same thing just light up when i turn on my parking and or headlights but nothing on the dislpay come up and pressing any button wont do anything is there some kind of code ??
I have a 1990 chevy truck and i have the same issue i have checked all the wirring,fuses everything under my dash i found a relay that wasnt working correctly i replaced it and the box on the dash with on out of my other 1990 chevy truck and still nothing if some one can help with this please email me at [email protected] Thank You
Wow. Same problem here! I have a '91 K1500.. Tried a used one, but wasn't sure that one was good when pulled from donor truck. But my stereo quit working about the same time. Stereo display shows FM 96.1 but no sound and can't change station. I hoped that someone here would have a definitive answer, but found only similar problems. Good luck to all!
I've got the same problem, with my 90 chevy 4x4 and my 92 chevy 2x4. Everybody tells me it's the early digital heat/AC controllers that have been problematic since day one. Nowadays the junkyards are picked clean, remanufactured ones are $550, and brand new controllers are $700-plus! Life is not good! Somebody pease help us! epluribus36
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