You might find this link to my website useful.
Go to www.audi200.org.uk click the menu link at the bottom for "Technical Pages" and the first item in the "Type44 General Information" section is a pdf for the climate system which shows you where everything is, how it works and includes how to retrieve the fault codes stored in the climate control head.
I hope that helps you. 
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Current:
99 Subaru Forester S-Turbo Auto - interesting... but it's not a quattro
91 Reliant Scimitar SST 1400 - no.39 of 42... something for the weekend
Previous:
Two consecutive 1989 Audi 200 Quattro Turbo Avant, 1B
1990 Audi 100 SE Avant, NF
1986 Audi 100 CD Avant, KU
1987 VW Passat GL5E Estate, JS
"Honorary" triple member of the 200,000+ Club
Audi 200 in the UK (legacy website)
Classic Audi member no: 258
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