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post #1 of (permalink) Old 11-07-2005, 05:39 PM
chickenlittle
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A/C Compressor Clutch

Anyone have any trouble shooting tips for the A/C compressor clutch on a 91 Bronco? 5.8L engine. It does not engage when I turn on the A/C. I want to explore all options before I go and replace the darn thing. THX
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post #2 of (permalink) Old 11-07-2005, 07:10 PM
 
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Re: A/C Compressor Clutch

First make sure you have enough freon in the system. Use a gauge designed for it. I changed my 1990 Bronco over to R-134A with a flush and retrofit kit. Haven't had problems since. Next with the truck running and the A/C turned on check to see if you have voltage going to the high pressure switch. You should be able to jumper the wires for the high pressure switch and see if you have voltage going to the A/C clutch. Usually it turns out being low on freon so make sure you check that first.
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post #3 of (permalink) Old 11-14-2005, 11:35 AM
esm
 
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Re: A/C Compressor Clutch

I don't see what low freon has got to do with the clutch engaging or not. Does the clutch "snap" towards the compressor when you turn on the AC? If no, it may not get power. If yes, does it turn the compressor or not? If not, the clutch may be worn out. I had the same problem with my '96 Bronco.
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post #4 of (permalink) Old 11-14-2005, 08:47 PM
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Re: A/C Compressor Clutch

the compressor cycling switch on the reciever/drier will stop the clutch from engaging if theres not enough pressure /freon to avoid burning up the compressor. Pull the connector off and jump it with a paper clip if the clutch engages its low on freon, if not check for voltage at the clutch harness while jumping, if it has 12 volts, yes the clutch is toast...
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