grinding noise near the engine compartment

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?

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

Agree, could be a bad tensioner

Yukon Joe

^ +3 Welcome and Good Luck!

Hey, I bet it is a tensioner

-Greg

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

Wilson said:

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

Click to expand...

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

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

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

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.