'92 Mazda Truck Air Conditioner Problems
 

First summer with this truck, and the air conditioner was down a couple of cans of freon (according to the sight glass). Had to hot wire the compressor clutch to install the freon.

Even after putting in two cans, the compressor clutch still won't engage. The fuse is good. Guessing that it might be the low pressure switch.

Two questions: Where is this switch? Can I replace it without breaking into the system?

If anyone has other ideas as to what to look for, please advise.

Thanks,
Bert