Fan clutch question
Thread Starter
Pro
Joined: Aug 2013
Posts: 633
Likes: 36
From: Cincinnati Ohio
Fan clutch question
My '75 L-82 seems to make a lot of "air moving noise" when the engine revs. The fan clutch may be a little harder to spin than I think it should. Is the fan supposed to disengage when revving? I think I just started to notice the "noise".
Race Director
Joined: May 2006
Posts: 18,756
Likes: 2,589
on a totally cold engine that is turned off, can you spin the fan by hand and does it rotate about 1 to 1 1/2 turns? Typically the fans will loose their internal fluid and leak and spin too freely.
Have you replaced the original fan clutch and if so did you replace it with a thermal or centrifugal clutch, thermal being preferred.
Have you replaced the original fan clutch and if so did you replace it with a thermal or centrifugal clutch, thermal being preferred.
Burning Brakes
Joined: Oct 2015
Posts: 1,093
Likes: 98
From: Roselle Illinois
Instructor
Joined: Jun 2011
Posts: 206
Likes: 75
From: Kernersville NC
I know it locks up as temp rises, but it's also noisy on cold startup. This is with a the rebuilt original clutch fan.
Thread Starter
Pro
Joined: Aug 2013
Posts: 633
Likes: 36
From: Cincinnati Ohio
on a totally cold engine that is turned off, can you spin the fan by hand and does it rotate about 1 to 1 1/2 turns? Typically the fans will loose their internal fluid and leak and spin too freely.
Have you replaced the original fan clutch and if so did you replace it with a thermal or centrifugal clutch, thermal being preferred.
Have you replaced the original fan clutch and if so did you replace it with a thermal or centrifugal clutch, thermal being preferred.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Race Director
Joined: May 2006
Posts: 18,756
Likes: 2,589
Bearing
No it does not spin freely at all. I can only push or pull it. It will not spin. In fact, it takes an effort to push it around with my fingers. I thought maybe it's too tight. I know the "noise" is there when cold, but now it's there all of the time. I'm not sure if it always was or I'm just now noticing it.
Melting Slicks
Joined: Feb 2006
Posts: 3,105
Likes: 96
From: Sunrise FL
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
Fan Clutch Operation & Troubleshooting
Hayden produces a lot of replacement fan-clutch's and has a great article that explains a lot of the nuances related to the different clutch's and how they operate. You might find this useful in understanding how they operate and troubleshooting them.
Good luck... GUSTO
Good luck... GUSTO
Thread Starter
Pro
Joined: Aug 2013
Posts: 633
Likes: 36
From: Cincinnati Ohio