Adjusting a Fan Clutch - Page 2 - Chevelle Tech
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post #16 of 18 (permalink) Old Aug 2nd, 15, 7:17 AM
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Adam
 
Join Date: Nov 2008
Location: New York
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Re: Adjusting a Fan Clutch

Thanks LevonH, I've just figured out my Chevelle's running hot problem. After cruising for about a half hour yesterday (85 degree heat), right after I shut the car off (and it pissed out about a cup of antifreeze), I checked the fan.

Sure enough, it spun as freely as when the engine was cold.

Looks like I'm ordering a new clutch assembly from Summit today. I'll go with the recommended Hayden heavy duty-thermal 2747. I think they're about $50.
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post #17 of 18 (permalink) Old Aug 9th, 15, 4:35 PM
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Join Date: Oct 2008
Location: new jersey
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Re: Adjusting a Fan Clutch

I did adjust the fan as described and it lowered engine temp
About 8 degrees while cruising and has eliminated creeping
Up temps, I can now look thru the windshield while driving
Instead of looking at the temp gauge
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post #18 of 18 (permalink) Old Aug 10th, 15, 7:49 AM
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Adam
 
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Re: Adjusting a Fan Clutch

Installed my new clutch fan assy., Hayden 2747 and also a new 19” Hayden fan. Removed my shroud and reinstalled it with some thin weather stripping foam sealer for a nice tight fit against the radiator with no air gaps.

Results:

I can definitely hear that “school bus” or “garbage” truck sound coming from the new clutch fan assy. Didn’t hear that with the old one. The car runs cooler while cruising, about 10 – 12 degrees (180-185), but still heats up to about 205 while coming to a stop. So while I reduced my temp when driving, the new setup didn’t really change anything when idling. Which is odd, as I thought my problem was the old clutch assy. Not working properly to draw air through the radiator while stopped. Oh well. It still burps out radiator fluid after cruising for a while and shutting it off.

My Chevelle is an A/C car, so perhaps the condenser isn’t allowing enough airflow. I’m also going to change the thermostat to a 160 high-flow (currently a standard 180) and see if that helps. The radiator is a 4 row heavy duty unit in rather good shape. But perhaps it’s time to change it as well.
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