clutch fan operation
01-13-2011, 10:53 AM
#1
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Year: 87
Model: Cherokee
Engine: 4.0
clutch fan operation
I have an 87 4.0 liter with the stock clutch fan and electric secondary fan for the cooling system.
My question is in the winter when I first start up the cherokee in the morning with a temp in the thirties the clutch fan is spinning all the time. Is this normal for a clutch fan?
I thought that the clutch should be temp sensitive and when it is cold not engage and spin the fan. And only spin when it reaches a set temp.
Does any one know how these clutch fans are to operate on the 4.0 liter?
My question is in the winter when I first start up the cherokee in the morning with a temp in the thirties the clutch fan is spinning all the time. Is this normal for a clutch fan?
I thought that the clutch should be temp sensitive and when it is cold not engage and spin the fan. And only spin when it reaches a set temp.
Does any one know how these clutch fans are to operate on the 4.0 liter?
01-13-2011, 11:00 AM
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Model: Cherokee
I have a '99, but I also thought I had an over-active cooling fan. Turns out the thing will run like crazy when the defrost is on. See if it makes a difference with the defrost on or off.
01-13-2011, 11:06 AM
#3
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Year: 1991
Engine: 4.0 I-6 H.O.
It will still spin, because of friction and inertia, when cold, just not a "lock up" condition as when it is warm.
usually when a clutch goes out, it will not "lock up" not the other way around
usually when a clutch goes out, it will not "lock up" not the other way around
Last edited by captainofiron; 01-13-2011 at 12:14 PM. Reason: hurr durr cant type
01-13-2011, 11:15 AM
#4
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Year: 1999
Model: Cherokee
Engine: Gas
My theory on this was that when you turn it off, the temp rises and the clutch engages. So the next time you start it, it is locked up for a few seconds. This is entirely based on theory and I have never seen the inside of a fan clutch.
01-13-2011, 12:57 PM
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Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
the clutch fan will alway spin when the engine heats up the internal clutch will cause drag to occur on the blades thus creating more air pull thru the radiator
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