Chief_Handy
OBS Enthusiast
Hey guys I've replaced the fan clutch the water pump and the t stat. The fan still won't disengage. I don't know why that fan would be spinning all the time following the RPMs engine.
Clutch Fan won't disengage
- Thread starter Chief_Handy
- Start date
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As has been said multiple times, the typical fan clutch will ALWAYS seem to be engaged, even when it isn't. Folks THINK it's spinning fast, moving a lot of air...
...because they haven't seen it or heard it when it's ACTUALLY engaged.
If you've ever had one lock-up, you'll know how much air they can move. You'll see Dorothy and Toto fly past, and the fan howls like a dog baying at the moon. Fuel economy drops, power is noticeably down.
...because they haven't seen it or heard it when it's ACTUALLY engaged.
If you've ever had one lock-up, you'll know how much air they can move. You'll see Dorothy and Toto fly past, and the fan howls like a dog baying at the moon. Fuel economy drops, power is noticeably down.
L31MaxExpress
I'm Awesome
Never noticed that unless the coolant is hot and the PCM is pulling a ton of timing.Exactly.
And no acceleration power from a stop. Like absolutely none lol
That's only if it was bad and staying fully engaged
I've had two locked-up fan clutches. '76 Chevy Nova 350 4bbl., and '03 Trailblazer 4.2L inline six. When the clutch locked, power dropped dramatically, even from cold. The power consumed by spinning the fan is more than I'd have thought a fan belt would transmit.
L31MaxExpress
I'm Awesome
10 hp and 15 ft/lbs is what a fully clutched in Duramax fan draws with a 25% under drive pulley.
It'd be more than that if the bearing locked-up. Even when the clutch is fully-engaged, there's still some amount of slippage especially at higher RPM.
454cid
Sooper Pooper
Mine will actually be visibly disengaged. I wonder if the Hayden clutch has gone bad. From a cold start it'll be engaged, then as it warms up it'll disengage enough such that I can stop if by hand. That clutch isn't that old either.... Maybe 5 years, and not that many miles. In my limited use of the truck, I haven't noticed any cooling issues, Though.
LOL!
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