Quote:
Originally Posted by rgnprof
Ok, I bought an infrared thermometer today and some R12 manifold gauges and did some checking. I am now beginning to think it might be a bad fan clutch. The temperature at the drier switch really struggles to get to 52C so the aux fan doesn't come on much - when it does the fan works fine. The high pressure is between 250-275 psi and low side is around 30 psi, with idle at 1500-2000 rpm (that was with the aux fan running).
While idling with the A/C on, the idle is slowing down a lot and the A/C clutch stops periodically - just for a second or so at a time. If the aux fan does not come on the car may stall. Could this have something to do with the fan clutch, or something else?
Again, if I jump the drier switch and let the fan run all the time the A/C clutch seems fine and the car idles fine.
Ahy thoughts? Thanks,
ryan
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Do you have a high-pressure cutout switch? If so, it could be bad, and opening at too low a pressure. Slower idle is probably fine, but the AC clutch disengaging is not.