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Old 04-04-2011, 04:53 PM   #1
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Fan Clutch Engaged EVERY Start Up...

Every Time I Start my Wrangler, the Fan Clutch is Engaged until I Drive about 1/2 Mile Down the Road.

The Engine can be Warmed Up or Cold, the Clutch will be Engaged.

Does this Happen to anyone else, or is mine Shot and need Replaced?

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Old 04-05-2011, 12:06 AM   #2
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Happened on my Mustang...I'd say replace the clutch and go on about it.

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Old 04-05-2011, 12:25 PM   #3
Knows a couple things...

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If you replace the fan clutch, make sure not to lay the box it comes in down flat before you get it installed. Keep it vertical until you get it installed. Laying it flat can allow the viscous fluid inside to move out of position and ruin the clutch.
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Old 04-05-2011, 01:13 PM   #4
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Quote:
Originally Posted by Jerry Bransford View Post
If you replace the fan clutch, make sure not to lay the box it comes in down flat before you get it installed. Keep it vertical until you get it installed. Laying it flat can allow the viscous fluid inside to move out of position and ruin the clutch.
Thanks.

Def. wouldn't have even Thought of that, and prob. Killed the New one.
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Old 04-05-2011, 02:53 PM   #5
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what are other good ways on testing the fans clutch, it seems like mine is always on.
I know when its working properly it will always spin a little due to a bit of drag, but my fan always seems to be on all the way as my TJ sounds like an air plane every time I rev it up on park or neutral, cold or not.
Its hard to tell while driving because road noise and stuff it to much.
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Old 04-05-2011, 03:20 PM   #6
Knows a couple things...

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When the engine is hot, the fan should be hard hard to turn, to overcome the clutch that is engaged when hot. When cold, the fan should be very easy to turn to the point it will even spin a bit after you give it a spin with your hand.
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Old 04-05-2011, 03:44 PM   #7
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what do you mean by turn?
for some reason Im thinking you mean spin the fan by hand?
sounds like a good way to get hurt. lol so im not sure what your turning and with what?
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Old 04-05-2011, 03:49 PM   #8
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Mr. rpm, not sure if your being funny or not. He is saying turn the fan by hand, just make sure the engine is not running when doing this test.
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Old 04-05-2011, 04:00 PM   #9
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lol, no not being funny. I just honestly wasn't sure.
I did not think the fans resistance by hand with the engine off would be any different being hot or cold. did not know the clutch stayed engaged when the engine is off but the temp is still hot.
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Old 04-05-2011, 04:03 PM   #10
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That's the job of the viscous fluid Jerry was talking about. This fluid changes with temp causing the fan clutch to either engage or disengage. Before you start your jeep in the morning try to spin the fan, it should spin free, if not the clutch is engaged and the fan clutch should be replaced.
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Old 04-05-2011, 04:28 PM   #11
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the jeep was cold as I just went outside to see how easily it would spin (hasn't be ran in 4 hours) and the fan spins pretty easily but it defiantly does not spin freely. as soon as my hand stops putting force on the fan it stops instantly. theres no extra spin.

I ran it for about 20 mins and turned it off and felt no difference in fan resistance. 20 mins is not very long but during that whole period the fan was on and seemed to be spinning pretty hard. enough that the whole area is gusting with wind. but the fan was still easily spun by one hand.


ill pop the hood after my next long ride and see what it feels like.
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Old 04-05-2011, 05:17 PM   #12
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Just went Out and Checked Mine, and it's the Same as Mr RPM.

Although not Tuff to Spin, there is Resistance, and as soon as I take my Hand Off, the Fan Stops. Tried it in both Directions and same thing.

I'll Check it again Tomorrow Morning, but I'm sure it'll be the same as it just was now.

Thanks for the Help Guys! I knew there was something Wrong when I Started to Notice how Often it was Engaged.
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Old 04-05-2011, 05:35 PM   #13
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I have heard many vehicles have a lot of loud fan noise for the first few minutes after starting . I know a couple vehicles that did it when they were new so I never thought nothing of it other than it was an annoying sound . It may be true about laying it flat would ruin it , I find it hard to beleive that a clutch sat verticle from the time it was made and delivered to the many places it goes before you take it home no matter how big the letters " this side up" are but who know for fact .
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Old 04-05-2011, 06:40 PM   #14
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Mine also sounds like a jet engine when just started cold or after sitting idle for a while, won't matter soon, e-fan here I come! Subscribing either way because I'd like to know if this is normal

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