Question about 2002 BMW 318td

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Which relay is the a/c clutch one on a 2002 318i

No power at clutch fuses ok

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There will not be any power at the ac clutch if the system is low or out of freon. A simple way to test the clutch to see if it is working is to disconnect the wire near the compressor clutch and apply +12 volts to the clutch end of the wire(for just a few seconds) and the clutch will make a click sound turning on. Do not leave it connected for longer than needed to here it click (which means the clutch is turned on). Your public library should have either "Alldata" or "Mitchell on Demand" which are auto repair programs which will give information for any car that it lists. At the library the use of the programs are free and you can print any information for the cost of the copies. The dealership can also provide this information is they are willing to get it.

Posted on Jan 17, 2013

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Problem is in the a/c circuit. Any time the defrost is on the a/c compressor will cycle on & off as it is used to dehumidify the air directed to the windshield. That's why the fuse can blow even in defrost mode.

Unplug the power connector at the a/c compressor and see if the fuse still blows. If not, then with a dmm or vom test a/c clutch winding for short. If ok, then test clutch diode for short. The diode is usually mounted at the clutch winding, but I've seen Chevy's with a diode that plugs into fuse/relay block under the hood. I have replaced these so don't overlook it.

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