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S-10 & Blazer 1982-2005
The S-10 and Blazer was arguably the most versatile and accessorizable mid-size truck and SUV on the market.
Platform: S/T-series & GMT 330

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Old 04-23-2009, 08:35 AM
CF Beginner
Join Date: Sep 2008
Posts: 11
Default FAN CLUTCH for SURE????

Okay, How can I be 100% sure my fan clutch is good or bad?
When I cold start it the fan starts out already making noise as if I had driven it on a hot day. After driving it 1/2 to 3/4 miles it returns to normal.
Should this be the norm? Should it be just opposite due to the cold start?

Thanks in advance.
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Old 04-23-2009, 10:47 AM
EvansBlue's Avatar
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April 2009
2000 Chevrolet Blazer
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Most of the time the fan will engage for a little while on start, but usually by the time you get on the road, it clutches out.
Brent Evans

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Old 04-23-2009, 10:57 AM
Mike Sigmond's Avatar
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2003 Chevrolet Silverado 2500
Join Date: Apr 2009
Location: Orange County, CA
Posts: 1,955

My truck does the same sometimes, Isnt there a temp sensor that controls it?
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Old 04-24-2009, 02:33 AM
CF Beginner
Join Date: Sep 2008
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Not sure. Let me know if you find out.
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Old 04-24-2009, 07:25 AM
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Join Date: Nov 2008
Location: Bowie, MD
Posts: 2,955

It is normal. The viscus fluid in the clutch settles at the bottom of the clutch when it sits. As long it goes away it is normal
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Old 04-24-2009, 07:38 AM
in2pro's Avatar
2007 Chevrolet Tahoe
Join Date: Apr 2008
Location: Austin, Texas
Posts: 6,681

There shouldn't be any leakage from the clutch,
don't confuse it with a water pump leak, as both fluids can be slippery to the touch.

There should be very little to no lateral movement at the bearing

There should be no roughness when you rotate the fan manually (with engine off of course)
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Old 04-24-2009, 07:38 AM

2000, 2500hd, bad, blazer, chevrolet, chevy, clutch, engage, express, fan, lateral, long, movement, remove, removing

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