HELP! - Fault Codes

[KWHines@aol.com]

Fellow Q-listers:

Sorry for the BW, but I haven't received any feedback on my previous post.  I
have two questions:

1) The climate control system displays approx. 20 "codes" - are any of these
fault codes for the ECU or related components (temp. sender, etc.)?

2) If yes, then which codes do I check?

All feedback will be greatly appreciated as I'm trying to avoid the dealer at
all co$t$.  BTW, this is for a cold start problem my mechanic couldn't
diagnose.

Thanks,

Kennon Hines
1990 Coupe Quattro
Atlanta, GA