Motor fan moving or shaking

I have a toyota tundra 2003 v 8 and start it making a noise in the motor and open the hood and noticed that it was the fan that was moving alot but it doesn't do it when the truck is cold and sometimes when it has beeb turb on foe a while or used it sounds like it touches the radiator that how bad it is .  

Thefan is working find theproblem is that it shakes when thetruck gets hot
Miguel DuranAsked:
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JohnBusiness Consultant (Owner)Commented:
The fan should run after the motor is generating heat. So no surprise that it is not running when cold.

But it should not touch anything at all. The fan bearings are gone allowing the fan to move in the wrong way and now the blades may be bent.

You will need a new fan from the dealer.
dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:
This looks like a mechanical fan rather than an electric one.

Number of possibles here.  Bolts holding the fan onto the clutch assembly have come loose.   Clutch assembly has come loose on it's shaft or mount on the engine.  Clutch assembly is worn (or broken).

Take it to the local garage and they should be able to tell you with a quick inspection what the problem is.

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JohnBusiness Consultant (Owner)Commented:
If it is a mechanical fan, the fan bearing could have disintegrated from wear and heat. You need to service it immediately to prevent even more damage.
Is the fan mounted on the water pump pulley via a viscous coupling? If it is and the coupling is worn, the wear will generate a lot of noise and vibration.
Alternatively, if it's a fixed fan bolted directly to the water pump then the water pump bearings are shot and the pump will have to be repaced.
If it's an electric fan then the likely cause is either excessive wear in the motor or a broken blade causing it to run out of balance.
dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:
Comments cover the majority of possible faults that this problem could be caused by.
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