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I have read about aftermarket clutches not being as smooth or variable on their engagement, so they seem  like the run more. They also don't seem to last as long. 

Personally I would stick with an OEM fan clutch. 

 

Why do you think it's bad?

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Over heating with the fan running would worry me. Maybe something is clogged and not allowing either good water or air flow? I know the 2nd gens are prone to the radiator clogging from the crank case breather. But dont know enough about the 4th gens to offer any advice.

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this is a 4th gen 6.7 I have talk to mechanic and was told the it may run because it has the oil in it . but I never hear of feel it fully engage when the temp is up. and my fuel mileage has dropped 2mpgs which is another system of a bad clutch. the radiator is clean and was flushed last summer. this has led  me to the clutch  

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Fan's that run too much or too little should throw a code, so go over your symptoms some more. 

 

How do you know it's running all the time? Does it vary rpm?

 

Describe the overheating. 

 

 

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