Ed, There should be a pressure switch somewhere in the coolant line, that opens the circuit to the compressor clutch when there is not enough coolant. Unplug it and jumper the contacts in the plug. If that gets the compressor working, look at the sight glass. A steady stream of bubbles indicates a low charge. If it uses R12, be prepared for a BIG bill for freon when you get it recharged. If it's R134A you can get a do it yourself kit and the little cans are cheap. If it's low enough to trip the pressure switch you will probably need at least two, maybe three cans. If it's R12, it's illegal to do it yourself and they don't make the little cans anymore. The equivalent of what the little cans held, that used to cost about $1.50 is now selling for about $50 to $60 at a licensed service place. Russ Hoyt Hoyt's TV Exeter, NH ----- Original Message ----- From: "Tel-Tek Electronics" <teltek3@xxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Wednesday, May 12, 2004 1:32 PM Subject: [TechAssist] 1994 GMC Van (AC Question) > Sort of off topic but does anyone know if the 1994 GMC Safari has a > Compressor Clutch Relay. > Found my A/C not working. Normally when I call for Air, I hear the Click on > the Compressor Clutch, and I don't hear it anymore. Have checked all fuses > (OK). Is there a Relay somewhere that supplies power to the clutch, and does > anyone know where it it. I see a couple mounted side by side, but not sure. > And our latest Chilton at the Library is 1991. > Some of you Shade Tree Mechanics might be able to help out on this one. > Especially you Southern Folks.;-) > > -Ed- > Tel-Tek Electronics > Ontario-Canada > > teltek3@xxxxxxxxxxxx > > > -------------------------------------------------------------------------- --- > Lost Password: > http://www.tech-assist.org and select "Login Problems?". > Email Archives: > //www.freelists.org/archives/techassist/ > ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/