HOT or COLD!

Sup guys, its been a while for me here. I just bought a 89 Coprice(9C1) last weekend. Its in realy nice shape. No problems, expect :rolleyes: The climate control...Its either HOT or COLD, no in between & thats with the heater on or off.

I'm not sure on how the controls work, never had to take the dash down, so any ideas or experience would be appreciated.

I'm a Ford guy, but for some reason I have wound up with Chevy's. I went from having a 68 fairlane, 95 Taurus, 89 crown vic and a 99 crown vic TO having two 95 Coprices & two 94 Coprices, a 85 CUCV and a 80 Firebird.

I've trimmed the fat to a 94 Coprice, the CUCV, pontiac and the 89 9C1 :sunglasse

Later models use an electric damper motor controlled by a module. The damper motor position mimicks the control knob position by balancing out the resistance of the control knob with it's position feedback resistor. The circuit is something like this:

http://72.19.213.157/files/HVACDamperControl.jpg

Can you elaborate some more, I don't want to have to do exploratory surgery on my vehicle. :icon16: