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You're very possibly low on freon, and the cycling on and off is the low-pressure switch cutting the system in and out. Happened to my 1990 700 when it got low. If you've had the R134 conversion, try hooking up a can and charging the system. Otherwise, you'll have to take it to the "pros".
I'm curious - do you have the manual climate control with the three dials? Or the version with sliders for temperature and a dial for fan speed?
The reason I ask - I've been trying to find my AC relay without success. And I have a curious condition where my AC runs all the time! Trying to pinpoint the problem.
Good luck,
b
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