Does anyone know where I can get a good wiring diagram to diagnose the AC system on a 93 945 (R134a)? The Volvo website doesn't have anything like it to buy.

The system works fine, but the compressor always comes on the second you turn on the blower fan, regardless of where the "AC off" swith is. If the blower is in the on position when you start the car, it gets pretty rough - the compressor is engaged during startup, and cranking is especially hard.

I know it's not the MCC panel, because I replaced it. Seems like the next thing to do is try to get in there and see what's going on - I'm thinking perhaps there's a relay somewhere in connection with this that's gone bad. Just don't know where it is.

If anyone has had this experience too, I'd love to hear from them. I think it may be a unique wiring problem, perhaps?

Thanks for any suggestions.