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Unread 04-15-2011, 02:20 PM   #1
thebeast64
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YJ A/C Clutch Not engaging

OK guys, I posted about this on the OC roll call thread, but it doesnt see as much traffic as this so I figured that I would put it out there again. I have a factory A/C system that isnt functioning. The blower motor works, and the system blows out sorta cool air, but that is about it. Im not sure if the compressor clutch is getting power, so Im just curious as to how to check the Clutch relay and where it is. This is the wiring diagram that I have as or right now and its great, but it doesnt show exactly where the things are located. And its starting to get hot here in Socal, so my A/C is going to be needed soon!



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Unread 04-15-2011, 02:48 PM   #2
lespaul_custom
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when you turn the fan on, are you turning the knob to the right of it also? you could pull the plug on the compresser and test it with a voltmeter for power. if the system is low the hi/low switch wont allow the compresser to cycle at all. and the relay is in the power dist. box under the hood by the battery.
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Unread 04-15-2011, 02:52 PM   #3
AZ94YJ
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With the ac on run a jumper from the positive side of the battery to the clutch, and see if it engages... Then check your pressures, your pressure may be too low...
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Unread 04-15-2011, 02:56 PM   #4
thebeast64
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Ok, So im going to go to orvacs to get a volt meter and jump cable. Ill get back to you guys very soon!
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Unread 04-15-2011, 04:14 PM   #5
thebeast64
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ok, so there is no power to low pressure switch at all. from looking at this diagram, im thinking its got to be the clutch relay because when i engage the clutch with a test lead, it works.
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Unread 04-15-2011, 05:08 PM   #6
AZ94YJ
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Maybe... When you hooked up the jumper did it blow cold? Did you check pressures with a set of guages? Not saying it couldn't be the relay, but it's usually something simple...
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Unread 04-15-2011, 05:22 PM   #7
thebeast64
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It blew REALLY hot....
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Unread 04-15-2011, 06:44 PM   #8
AZ94YJ
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Yeah there isnt any freon in it... You need to charge it, you'll need to jumper the clutch and charge it... That should bring the pressure up enough to allow the low pressure switch to close and energize the clutch... That is pretty common... You may want to charge it with that freon that has the dye in it too in case there is a leak you'll be able to find it...
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Unread 06-06-2013, 03:57 PM   #9
GBE355
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i know this thread is kinda old but i have a yj that has propper refridgerant pressure and blows cold when the pressure switch is bypassed... replace the switch today assuming that was the problem and im back to square one. The clutch wont engage! any ideas of what else my problem can be?
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Unread 06-06-2013, 05:56 PM   #10
jeepinjames20
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Part of the problem could be you're running with doors and a top in SoCal.
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Unread 06-06-2013, 09:04 PM   #11
pasinbuy
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Originally Posted by GBE355 View Post
i know this thread is kinda old but i have a yj that has propper refridgerant pressure and blows cold when the pressure switch is bypassed... replace the switch today assuming that was the problem and im back to square one. The clutch wont engage! any ideas of what else my problem can be?
I am not a ac guy but, how cold does it run? If just a little cold you could just need Freon.
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