03 F250. 5.4 2v

I purchased it a month ago.

Squeak under the hood. It appeared to squeak in relation to the movement of the tensioner......simple right?

Replaced Tensioner and Belt..... Still squeaking

AC not working at all. Compressor never kicking on.....replaced compressor, accumulator, and orifice tube. AC works now!.....squeak still there....

Notice fan wobbling.....shut truck off.....fan clutch shot... replaced....STILL SQUEAKING!!

Obvious answer....sound still on that side of the engine....Idler pulley....I just replaced it AND THE DANG TRUCK IS STILL SQUEAKING!!!!!!!!!

HELPPPPPPPPPPPPPPPPPPPPPPPPPPP.

All that's left is the harmonic balancer, alternator, and power steering pump.......What could it be?

 

My guess would be alternator bearing. Pull the belt and spin/tug on it. I had the same issue on F150. Alternator was working, just making noise.

 

The alternator in my 08 5.4 squeaks like crazy when its cold. Very annoying but once it's warm it goes away. I feel your frustration

 

Thanks fellas. Definitely the alternator......


The above statement was a lie.

Alternator replaced, quiet for the first startup and my post....... it still squeals and the only front end moving parts that aren't new are the harmonic balancer and power steering pump.

Sound goes away after truck warms up a few degrees. Power steering works good and does not ever whine