[mmagliaro]

Okay. It finally did it again. Was working fine as my wife drove home,
then spontaneously quit working (compressor cycled off, and outlet temp
rose to about 65 degrees F).
She got home, left it running in the driveway, I went out,
tapped on the side of the lo pressure cycling switch with the butt end of
a screwdriver, ---- "CLICK" ---- on goes the compressor,
down goes the outlet temp to about 45, and the pipes
got cold and frosty again.

Where do I buy one of these? All the auto stores like NAPA, Pep Boys,
Autozone, do not list this part at all. Do I have to go to a GM dealer to buy
this part?