Viscous fan test

[ab56452001]

Hi can anybody tell me how to test my clutch fan please, ive heard of a couple of different versions, 1- that the fan should be hard to turn when cold, 2- the fan should spin around freely when cold ?,cheers.

[carlosprite]

It should bind up, it should not spin freely; there should be resistance.

[rainman]

start it up, get a rolled up news paper.
stick the news paper in the fan, fan should stop, when cold.
when engine is hot and the fan working the fan will not stop, be careful with the news paper. with practice you can actually "just hear it" when the engine is hot and revved.
good luck with it.

[ab56452001]

So when cold no resistance , when hot resistance is that correct = if its hot and stops spinning when i put the paper in, its nackered ?

[rainman]

Originally Posted by ab56452001

So when cold no resistance , when hot resistance is that correct = if its hot and stops spinning when i put the paper in, its nackered ?

yes.
when hot is should be locked up solid, bit more then just "resistance" - be careful with the newspaper.

[ab56452001]

ok ill give it a test tomorrow,thanks

[BLU-125]

Or do what I do and buy a new one and keep the old one as a spare! I actually have a few spares, do you want one?