FAN CLUTCH for SURE???? - Chevrolet Forum - Chevy Enthusiasts Forums


dmhoo29's Avatar
CF Beginner

Join Date: Sep 2008
Posts: 11

April 23rd, 2009, 9:35 AM   #1  

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.

EvansBlue's Avatar
CF Monarch

Join Date: Jul 2007
Posts: 5,913
Princeton, NC, USA

April 23rd, 2009, 11:47 AM   #2  
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.

Mike Sigmond's Avatar
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ROTM Coordinator

Join Date: Apr 2009
Posts: 1,828
Orange County, CA

April 23rd, 2009, 11:57 AM   #3  
My truck does the same sometimes, Isnt there a temp sensor that controls it?

dmhoo29's Avatar
CF Beginner

Join Date: Sep 2008
Posts: 11

April 24th, 2009, 3:33 AM   #4  
Not sure. Let me know if you find out.

MDTAHOE's Avatar
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Professional Mechanic

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Posts: 2,950
Bowie, MD

April 24th, 2009, 8:25 AM   #5  
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

in2pro's Avatar

Join Date: Apr 2008
Posts: 7,405
Austin, Texas

April 24th, 2009, 8:38 AM   #6  
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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