Posted by Bob Guy on June 28, 1998 at 16:50:18:
In Reply to: AC system has no pressure on high side posted by Mike M. on June 26, 1998 at 21:02:08:
There were a couple of years when GM used a special hi side fitting that had the schrader plunger deep in the service port. Examine yours, and see if this is the case. If not, could have fried compressor.