I had a similar problem on my R-12 equipped 94 Jimmy. Replaced the
low pressure switch and it's worked 100% of the time since I replaced
it, except when the fuel pump died. Part was around $20 at a dealer
and I was able to replace it myself without evacuating the freon.
Dunno if yours is the exact same thing, but it would be a cheap place
to start. Here's a good test for the switch, when the system stops
working pull the plug and short the 2 contacts on the plug, not the
switch, with a piece of wire, if the compressor comes on, the switch
is bad. Mine was located in the accumulator, dunno if yours is the
I just got finished with playing with this system. I too have come to
the conclusion its the pressure switch. I can start up the AC watch
the clutch on the compressor kick in, and everything works. Then it
will click off, and just a jiggle of the plug on the LP cutoff switch
is enough to get it going again. I also used a jumper and it will just
keep runnning and running and running. Compressor etc all sound fine,
but I did manage to add a small amount of freon, hope tht does not
hurt anythng, but its getting super cold now, just like when new.
MAybe it was a bit low, but I do honestly thnk its that switch on the
Thanks for your input
On Thu, 14 Aug 2003 15:27:32 GMT, Mike Levy
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