A/C not working at idle, compressor not cycling rapidly - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 07-30-2009, 11:00 AM Thread Starter
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A/C not working at idle, compressor cycling rapidly or stays disengaged..only at idle

Edit: Woops, goof'ed the subject line.

At higher rpms and at speed, the a/c works fine and blows cold.

At idle, the compressor will cycle quickly (few times in a few seconds) or just stay disengaged.

No A/C trouble or work on the system since I've owned it, which is 3 years.

Help? I'm thinking low charge?

Thanks in advance,

Paul

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post #2 of 7 (permalink) Old 07-30-2009, 12:18 PM Thread Starter
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post #3 of 7 (permalink) Old 07-30-2009, 03:29 PM
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rapid cycling could indicate a low charge, but if its cooling at higher speeds it doesnt sound like its low, and if its low enough it would cycle at all. it kinda sounds like you might have a weak clutch on front of the compressor or cycle switch acting up. i would lean toward the clutch. If you can catch it disengaged when it should be on then try tapping the front hub of the compressor. this usually works to verify a weak clutch field coil. note be careful cause if the compressor engages it might try to knock the hammer out of your hand.
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post #4 of 7 (permalink) Old 07-30-2009, 04:19 PM Thread Starter
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I was wondering the same thing, but figured a weak clutch would just get worse at higher RPM?
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post #5 of 7 (permalink) Old 07-30-2009, 05:25 PM
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Could be that the gap is to big and it is slipping at low rpm. This can be be fixed by taking the clutch off and removing a shim and then reinstalling, which would decrease the gap between the clutch and the pulley.

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post #6 of 7 (permalink) Old 07-31-2009, 06:14 AM
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when i gap clutches i usually try to get the hub as close to the pully as possible but not allow them to touch and rub when free wheeling. the actual spec is ( 0.014-0.030 ) and can be checked with a feeler guage.

only problem with setting this gap is sometimes there is only one shim or one too thick to remove to "close" the gap. be carefull when removing the center bolt and front hub because sometimes the shims will fall out. the shims usually will stick inside the hub though and a small screwdriver or pick will get them out.
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post #7 of 7 (permalink) Old 07-31-2009, 01:40 PM Thread Starter
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intermittent connection at the clutch electrical connector. cleaned contacts with acentone, problem solved....for now.
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