I have a 1986 Audi 5000s Wagon and currently my climate control system is stuck on high. I cannot turn off the system nor can I put it on any other setting other than defrost. I checked the fuses according to the manual, but to no avail. Do I need to replace the whole interior interface? Any solutions would be greatly appreciated. Shawn D. Gifford 1989 Audi 100 1987 Audi 5000s Wagon