I just got the report from my Air Conditioning shop. The compressor is spinning away like it should, but the pressures are about 75psi on both sides of the compressor.

Early 1987 300D (sold on the lot in October of 1986)
I don't think there has ever been R134a in the system. No records of it and I am contacting the PO now.
I had it charged with Freeze 12 last year. I don't know if they also added oil when they added the freon. (I just read about the lack of a sump in the MB set up and the need to add oil when you add freon.)

My gut reaction after reading up on the forum is that the compressor siezed and crapped up the condenser and expansion valve. I think I need a flush, a new compressor, condenser, expansion valve, receiver-dryer, and new o-rings all around.

The AC guy suggested a new expansion valve to start with and try it from there.

Any ideas?

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.