buckridge

I have a 1990 corvette and the climate control unit is displaying - -- the blower is stuck on high and the buttons don't respond. I tried cleaning the contacts but it didn't change anything. Any idea what is wrong

4corvettes

There is a YouTube video that addresses that very problem for your car. Search for Climate control repair-C4 corvette. I need to do this to my 1993 coupe. Good luck! Seems pretty easy to do.

4corvettes

I just reread your post and saw that you already cleaned the contacts. Maybe you can disconnect your battery for a few minutes and try resetting it that way.

grandspt

You might try checking the blend door module located under the passenger side dash area. I disassembled mine and found the main nylon gear cracked. The gear is press fit on the metal shaft from the factory and over time it splits and causes the timing to go off. I repaired mine because I couldn't find a replacement that would fit my 1996.
You have already cleaned the contacts on your climate control switches so this is what I would look at next.
Good luck!

belairbrian

If the OP has a 1990 his blend motor is on top of the heater core housing. PITA to get at. I think it was 94 when it moved to the bottom but I'm not positive. i do know my 92 is on top.

OP can you get the HVAC panel into diagnostic mode?