grinding noise near the engine compartment

[ozzie06]

Alright so I have had my 2011 raptor for about a year now and I have never had a problem with it. Until now. I am from phoenix but am living in flagstaff. Now as it got colder up here, whenever I would start my truck it would sound like the belt was grinding against something except it is not. The noise goes away after I drive my truck around for a little while. But it always happens when I start the truck up and it is extremely cold outside. It never happens when I go home to the valley. It also gets louder when I turn the wheels either direction, again it sounds like the belt or something is grinding against something else, but I looked under the truck and under the hood and nothing is touching the belt. Any thoughts on what this noise might be coming from?

 

[PropDr]

The first thing I’d look at is an Idler or tensioner pulley

 

[Yukon Joe]

Agree, could be a bad tensioner

Yukon Joe

 

[MotuMute]

^ +3 Welcome and Good Luck!

 

[Squatting Dog]

Hey, I bet it is a tensioner

-Greg

 

[Wilson]

could posably be a tensioner vibrating. I threw in the vibrating thing to be cooler.

 

[PropDr]

could posably be a tensioner vibrating. I threw in the vibrating thing to be cooler.

A Wilson that is cool ... now how cool is that

 

[Wilson]

fairly cool! the only thing I new how to spell wright off hand.

 

[beemerman]

Welcome. Just a guess. But may be a tensioner. Sorry couldn't resist. You'll find out soon enough we are a band of misfits, Jack

 

[pirate air]

You can remove the belt and rotate the tensioner and idler pulleys by hand and feel if they're rough. Another thing to think about is I know on mine when it starts and first runs for a bit when its about 30* and colder, the power steering pump makes a low humming whine till it warms up.