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Old 08-05-2014, 07:15 PM
fatfett fatfett is offline
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Default AC Compressor Cycling

Hello. My AC clutch is cycling excessively in, it seems, regular intervals. The low side refrigerant pressure seems to be OK. I've noticed that both the WOT AC relay and the PCM relay click at the same time at the clutch engages or disengages, so this has something to do with it. Can anyone give me some pointers on where to start? Possibly test the TPS or some of the sensors. None of the relays are bad themselves, I've tested them.
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Old 08-05-2014, 08:20 PM
fatfett fatfett is offline
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Default Re: AC Compressor Cycling

Turns out that the system was low. The WOT AC relay name is deceiving. That relay actually switches the compressor clutch on and off. When the pressure hits a low limit, the pressure sensor indicates to the ECM and the ECM actuates the relay to remove power from the AC clutch. That is what was happening until I was able to get enough refrigerant in the system to get the pressure up. Just FYI!
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a/c, air condi, clutch, relay

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