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would the fan belt on a v8 motor cause squeaking
fan belt needs tightened
getting old and cracking, then breaking
no
Belt is loose and slipping
Dust?
The most likely cause is the fan belt is slipping
On my Mercedes sprinter the cause of the fan belt vibration at low idle speed was the pully on the alternator.This pully should ratchet in one direction.
Besides having the p/s fluid cause the belt to slip, the p/s fluid will eventually ruin the belt.
Shadows have an electric fan. All engines are FWD. Hence the engine is sideways. No belt turning a fan. So whoever told you a fan belt was the problem is mistaken. More likely the cause is a timing belt.
If the whine happens when starting to move forwards, and then stops once the vehicle is moving, it could be caused by a loose fan belt. If so, tighten the fan belt, or replace the worn belt.
Belt too tight, or too loose, or drive pulleys out of alignment, or damaged.