Fan Clutch Oscillates

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Jan 17, 2014 | 09:46 AM

jetdoc

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Cargo Master

Joined: Jan 2005

Posts: 2,902

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From: Pasadena, Maryland

Fan Clutch Oscillates

Just as the title says....Stone cold engine, fan clutch engages and disengages. Cycling I guess would be a better term. I tried a search, but I must have used the wrong terms or something. Is this normal?

Leaking oil again this am...Somewhere up top this time. I cant win for loosing.

Jan 17, 2014 | 09:49 AM

timmyboy76

Lead Driver

Joined: Sep 2010

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subscribing.....whether mines, stone cold or warm after running awhile. With temp switch to bi or at feet, you can hear the clutch engaging/disengaging...

Jan 17, 2014 | 10:03 AM

BillyBob69

Lead Driver

Joined: Jul 2003

Posts: 7,404

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From: Wheatland, Mo

You sure its the fan clutch and not the AC pump clutch? That kicks in for defrost when warming up.

Jan 17, 2014 | 12:12 PM

jetdoc

Thread Starter

Cargo Master

Joined: Jan 2005

Posts: 2,902

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From: Pasadena, Maryland

Definitely fan clutch. You can hear it and feel the airflow.

Jan 17, 2014 | 02:07 PM

The Brad

Laughing Gas

Joined: Nov 2013

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From: SoCal

Mine has been cycling for a couple of years now. I replaced it with a Napa one and it does the same thing, usually after pulling a grade it partially engages, fully engages, partial,full... This goes on till temps drop enough to disengage it.

Jan 17, 2014 | 02:13 PM

jetdoc

Thread Starter

Cargo Master

Joined: Jan 2005

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From: Pasadena, Maryland

Quote:

Originally Posted by The Brad

I can see it happening on a warm engine but this was stone cold this morning. Funny thing is that my coolant temp was cold to the touch but the HPOP reservoir was scalding hot after only a few minutes of running. 138degrees by my el cheapo laser thermometer..