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Unread 07-12-2010, 11:22 AM   #16
TJ311
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This is pretty much why I hate fan clutches. When I start my Jeep cold, I hear the fan spinning up for a bit and then slowing down several times within the first 5 minutes of running. You can spin it by hand when cold/not running with a little resistance, but how do you really know if it's bad or not. If it is supposed to lock up as temperature rises, why does it spin up when cold? I'll be moving to an electric soon.

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Unread 07-12-2010, 12:13 PM   #17
Knuckelhead
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Quote:
Originally Posted by TJ311 View Post
why does it spin up when cold? I'll be moving to an electric soon.
Because the viscous fluid has to run back into its reservoir when the fan clutch is cold.
I would think twice (and read more) about running an electric fan...
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Unread 07-12-2010, 12:16 PM   #18
TJ311
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Quote:
Originally Posted by Knuckelhead View Post
I would think twice (and read more) about running an electric fan...
Think twice about what?
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Unread 07-12-2010, 12:38 PM   #19
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Originally Posted by TJ311 View Post
Think twice about what?
Installing something that is less efficient/reliable than the OEM setup...IMO
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Unread 07-12-2010, 01:18 PM   #20
TJ311
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Originally Posted by Knuckelhead View Post
Installing something that is less efficient/reliable than the OEM setup...IMO
Seriously? I guess it's good you added "IMO" because "my opinion" would definitely differ.
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Unread 07-12-2010, 01:59 PM   #21
Davids29
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There are 8 million other thread that you can argue about electric vs clutch driven fan setups. This thread is about what a good fan clutch looks like. Let's keep it that way.
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Unread 07-12-2010, 03:17 PM   #22
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Based on that limited video, I'd say your clutch is fine.

I am not a fan (haha no pun intended) of any spin test for a fan clutch. The fluid moves between chambers, so unless you know exactly what state it was in when it was shut off, there is no way to guess what it is going to feel like 10 hours later.

If your fan doesn't "roar" 100% of the time, then it is not locked up....and it is obvious that it is not too loose. Hence, it's probably not broken.
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