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Normally when they are cold, like first start in the morning, they will roar, thats the fluid being redistributed after it settled overnite, usually if they don't give you that roar for 15-30 seconds the clutch is bad. Once the fluid is spun around it gets quiet, then as it heats up it may get noisier, usually you don't notice it being inside and it normally won't do it just sitting there idling except on a hot day.
One thing I noticed is my old (bad) clutch fan didn't really put out much air. When I replaced it with new, the new fan would blow massive air. It blew leaves around under the engine.
One thing I noticed is my old (bad) clutch fan didn't really put out much air. When I replaced it with new, the new fan would blow massive air. It blew leaves around under the engine.
One thing I noticed is my old (bad) clutch fan didn't really put out much air. When I replaced it with new, the new fan would blow massive air. It blew leaves around under the engine.
I've replaced the thermal fan clutch on my Jeep, I can tell you a good fan clutch is NOT free moving cold, there is a noticeable amount of resistance, it will NOT spin freely if you push it, the moment you remove your hand it will stop.
When hot, the bi-metal spring on the front turns a valve that tightens up the clutch resistance even more.
So yes, you could say it should spin "more" freely cold than warm, but a better way to say it, is it should spin with greater resistance when warm than cold.