Some squeaking from under the hood?

[Texas7.3fromthe(830)]

Just recently my truck has been letting out a short high pitched squeak as it starts and when im drivin. I think it might be something with one of my bels but im not sure. Any thoughts or suggestions?

[BrianH]

I'd start with the belt then look at the idler pulleys. There's three of, two smooth and one ribbed. I wound up replacing all three on my truck one at a time. Spray a little WD40 with the tube on the pully you suspect to be squeaking, if the sound goes away you found your culprit.

[bucwheat]

It could also be a tensioner,the belt dressing spray wil help determine that.l

[miked.]

check bearings on all pulleys

[VB55Burt]

My squeak was the belt, caused by coolant starting to leak from the pulley shaft bearing, then running inside the pulley. FoMoCo wanted $278 for water pump, NAPA guy I've done work with for years said their pumps are US-made haven't had any comebacks since this productline introduced couple years ago $149, so I'm trying that. That was back in Oct., happy so far.