Climate control doesn’t turn on

In my experience the auto climate control units can be buggy. When my first one started to go out, i tried a second that didn't work at all and so i'm on my third.

I suspect it could be similar to problems that plague other electrical components: poor soldering joints (digital display and power supply) dried up capacitors (factory stereos).

Does the over ride button (top center) still turn the fan motor on?

Troubleshooting guide here:

http://www.xenonzcar.com/z31/Automat…ntroldiag.html

I just wrote mine off and got a new one from z31partsforyou that was tested. If you cannot troubleshoot it this is the best way to fix