fan clutch?
Moderator
Joined: Jan 2001
Posts: 56,984
Likes: 2,738
From: Virginia
No, it will be stiff when it's sitting. Usually it will turn and be locked when you first start the truck, and as the fan spins, the fluid moves to the correct places and it unlocks. Even though it is unlocked, it will still turn with the engine. The way you know that it's locked up and not working is it sounds like a 747 under the hood when you are driving down the road. If it's really noisy, then you have a problem.
Posting Guru
Joined: Nov 2004
Posts: 2,155
Likes: 1
From: sunny fla sometimes windy
There are two types of fan hubs, thermo and non thermo!! thermo of course uses heat
to engage. non thermo is always turning at about 60% slip. so if you have that one it
will always be making noise. Feel the center of the front of the hub if it has a little coiled spring it is a thermal unit if no then non thermal. I would change it to a thermal
unit when you get the cash to do it it will save some HP and be quieter, or you could
cut off the cat and run straight pipes.
to engage. non thermo is always turning at about 60% slip. so if you have that one it
will always be making noise. Feel the center of the front of the hub if it has a little coiled spring it is a thermal unit if no then non thermal. I would change it to a thermal
unit when you get the cash to do it it will save some HP and be quieter, or you could
cut off the cat and run straight pipes.
