is it a belt squeal?? my first obvious thought was the tensioner had died (as they do) but if both the belt and tensioner have been done, then perhaps one of the idlers has seized or is dying causing the belt to randomly slip? Other possibilities are the clutch pulley on the alternator is on its way out, although these normally make a nasty rattle sound.
Of course Im ASSUMING its a diesel *rolls eyes*
If a Petrol, the front crank pulley is prone to dying which will cause a squeak or rattle on occasion until it gets really bad.
Indeed. It's got to be a fully functional OAD pulley and if its travelled that far it may be the cause. It is driven by the accessory belt in fact it's usually the first pulley you slip the belt off when removing that particular belt and the tension is removed.
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Stupid sqeeky accessory belt/serptine thing..
