I have an '01 A6 2.8 with 112k and the AC stopped turning on all together. At first it would turn on about twnty minutes into a freeway drive, now nothing.

This has been probably addresssed somewhere else but all I found were the codes. I'll try that diag. but does this ring a bell? Bad compressor or a control module? For whatever the guess is, I'd like to know est. part cost in US.

Thanks for any help!

Matt in hot AZ.