Diagram of HVAC Venting?

[David.Ullrich at ferguson.com]

Anyone know where I can get a diagram of the HVAC venting system on my 1987 Coupe GT? I need one that shows all of the various parts including dampers, and parts that direct air over the condenser. Here's the situation (if I mess up any terms, I apologize in advance): I had the AC system converted to R134a while it was being repaired (it had TONS of leaks). Well, it is not getting as cold as I think it should. I took it back to the shop that did the work. We tested the system, it's full (no leaks) and is building proper pressures. The temp at the center vents is around 65 degrees when outside temp is 85. Not terrible, but we both think it should be in the low 50s or 40s. The condenser (part under the dash, I think that's the condenser) is getting plenty cold and is sweating like crazy. According to him, this means the system is working properly, so it is his thought that there must be an air leak in the venting system or that the air is not being directed over the cold condenser properly. he is a very good GENERAL mechanic, but does not specialize in Audis. So, he has tasked me with coming up with as much info and diagrams as possible. So, if anyone can direct me to any diagrams, it would be GREATLY appreciated. Also, any suggestions on things to check would also be great!

TIA!

Dave

1987.5 Audi Coupe GT "Special Build" 2.3 - Anthracite Black
1998 VW Passat GLS 1.8T - For Sale CHEAP