ubb@1234

I own a 1990 C4, been having trouble with the climate control module, heating air conditioner controls.

When I engage the controls the unit will work for a short time then the green light will flash above the selected button and the unit stops, doesn't matter if I'm using the heater or air conditioner.

Can this unit be taken apart and repaired? Thanks

65Z01

Yes, it can be repaired, bate.com does such work.

VETTLIFE

Very common problem, had this on my 90 as well.

Here's the fix:
If there are no codes or the unit has a mind of it's own this is your problem: