Originally Posted by StephenVA

NS, the squealing noise on start up is usually belt/tensioner friction due to the pulley(s) not spinning at the same speed as the belt due to the "bearing" being worn or ready to go. Recommendation is a simple quickie test. Remove belt when cold, check free play in tensioners/idle pulley, check belt for edge wear and cracking. Fire up engine for 1 min. Noise gone? Or try this other quick test: GATES: Diagnosing Belt Noise - The Spray Bottle Test- see youtube video.https://youtu.be/fPjmBQc2gGQ
If your mileage is over 60K replace belts, if over 100 replace lots more.

If we knew the engine size it would help....

It is considered normal maintenance to replace water pump, belts and tensioners at 80-100K on 3.0 engines. After all they are over 12 year old by now. In place of records replace it all and you will be happier in the long run.

Tensioners have little to no play new. The little brass/aluminum bushing wear out and allow side play. The noise is the metal on metal tear/wear. There are no "lube" points just check and replace as required.

www.ecstuning.com for images