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Originally Posted by 355
Do you have condensor coil cooling fans. Do you have a seperate relay to turn on your fans or is it common with your compressor clutch relay. I had the same problem with an old air system. The fan motors are permenant magnet motors, at highway speeds the blades are driven by the wind and the motor becomes a generator. It produced enough power to hold the clutch in and freeze everything up. I added another relay to isolate the fans from the clutch and have had no problems since. Don't ask how long it took to figure this one out. Steve
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I have electic fans on my truck. But I don't think it has anything to do with my problem. When the AC is on the cluch on my system does not cycle on and off.