AC just quit cooling suddenly.
Compressor is running, but not pumping freon thru sight glass.
Checked pressures: high side is 100, low side is vacuum, about 20 inches.
Shut it off, and low side very slowly returned to 100, after 30 minutes or so.

Assume clogged expansion valve?

Car is '91 300SE with all original system. Worked great yesterday.

Did a search on replacing expansion valve - not a pretty sight!

Tks,
DG