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Fan clutch test

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Old Oct 7, 2012 | 04:29 PM
  #1  
randerson1009's Avatar
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From: Edisto Beach, SC
Year: 1994
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Engine: I6
Default Fan clutch test

I did a search on testing the fan. My fan is hard to turn when cold and easy to turn when hot. Info on the forum says that is good. The Haynes manual disagrees and intuitively, that would seem correct. You would want maximum fan when hot.
Can anyone tell me which is correct?
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Old Oct 7, 2012 | 05:44 PM
  #2  
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From: Broward County Fl.
Year: 1989 xj sport 2dr
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easy when cold ,hard when hot . Replace it .
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Old Oct 7, 2012 | 09:48 PM
  #3  
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From: The Republic of TEXAS
Year: 1998
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Engine: 4.0L HO
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Originally Posted by randerson1009
I did a search on testing the fan. My fan is hard to turn when cold and easy to turn when hot. Info on the forum says that is good. The Haynes manual disagrees and intuitively, that would seem correct. You would want maximum fan when hot.
Can anyone tell me which is correct?
The test procedure in the FSM is some what long and drawn out and involves drilling a small hole in the fan shroud, inserting a thermometer, blocking air flow thru the rad, reving the motor, reading air temp as it passes thru the rad, blah, blah, blah. It'll take less time and about $35 to just install a new fan clutch. Besides, fan clutches slowly degrade in performance with time/miles starting the day they are installed.
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Old Oct 8, 2012 | 07:56 AM
  #4  
salad's Avatar
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From: Parham, ON
Year: 1999
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Engine: 4.0L OBD-II
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Originally Posted by randerson1009
Info on the forum says that is good. The Haynes manual disagrees and intuitively, that would seem correct. You would want maximum fan when hot.
Yes, don't believe anything you read on the Internet! It's full of basement-dwelling mouthbreathers and the woefully inept!



+1 sounds like it's bad, just replaced it. If it's original it should be done anyway
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Old Oct 8, 2012 | 12:15 PM
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Stick a rolled-up newspaper into it when it's all warmed up and running.

If the newspaper stops it, it's bad.

If the fan chews up the newspaper, the clutch is working properly.
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Old Oct 8, 2012 | 12:27 PM
  #6  
I Leak Oil's Avatar
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From: Frisco, Tx
Year: 1994
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Originally Posted by Firestorm500
Stick a rolled-up newspaper into it when it's all warmed up and running.

If the newspaper stops it, it's bad.

If the fan chews up the newspaper, the clutch is working properly.
Are we going to go over this again? This is dangerous and dumb.

It sounds bad just swap it out.
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Old Oct 31, 2012 | 07:31 AM
  #7  
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A few years ago I bought bad new clutch! Second one was good.
It is smarter to check first, replace later. And then check new one!
Newspaper test is really dangerous... For newspaper!
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Old Oct 31, 2012 | 07:47 AM
  #8  
salad's Avatar
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From: Parham, ON
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Was it from this amazing AutoZone place I keep reading about?
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Old Oct 31, 2012 | 07:54 AM
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Originally Posted by salad
Was it from this amazing AutoZone place I keep reading about?
bad clutch was from Advance Auto. Next one from there was OK.
It was 7 years ago for my first XJ.
I bought and installed HD radiator instead of checking clutch first.
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Old Oct 31, 2012 | 07:57 AM
  #10  
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From: +34° 25' 35.67", -81° 21' 12.04"
Year: 1993
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Originally Posted by Firestorm500
Stick a rolled-up newspaper into it when it's all warmed up and running.

If the newspaper stops it, it's bad.

If the fan chews up the newspaper, the clutch is working properly.
I do something similar. I just use the garden hose.

If you can make it stop by spraying it with water then it's time to replace it.
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Old Oct 31, 2012 | 08:41 AM
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Does anybody use sh.t to check fan?
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