Heater problem
1995 Audi 90 6 cyl All Wheel Drive Manual 94000 miles

My climate control system is not working. It will not change from heat to air or to defrost. the temp also will not change. I have it apart and have found the flap control motors. They will operate if you put power directly to them. I have tried changing the dash control unit and he computer to no avail. Don't see any broken wires. Any ideas?

Thanks

Bear