1988 GMC S-15 Jimmy Utility 4WD Base
Estimated Mileage
Miles
accurate info about this vehicle
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April 15, 2010, 11:04 am
Jim
Question: AC compressor relay clicks in the vent position
The car is a 1986 S15 Jimmy 4X4 with the 2.8 engine.
Recently I noticed a loud ticking sound. At first I thought it was a spark plug wire off. But the sound is 3 1/2 clicks per second no matter what I do. I got a stethoscope and traced the sound to the AC Compressor relay. The sound is only there when the air conditioner control is in the vent position and no matter what speed the blower is set on. I immediately checked the heater position and it does not click then. It is only present when the engine is running.
I checked engine speed and it is a little higher in the vent position, maybe 100 rpm more than it is in the heater position or in the off position.
I added a can of coolant to the AC with no change.
I can't figure where to test next. Any ideas would be appreciated.
Jim
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