My 2001 Ford Focus ZX3 makes a constant high pitched squeal while driving. Any ideas?

This is a loud sound that can be heard inside and outside the car. It only makes the sound when the tachometer reads between 1800 and 2200 RPM. It does not make the sound at all when the car is not moving, ie 2k RPM in park or neutral. The car has about 79k miles and the serpentine belt was changed at 50k.
My 2001 Ford Focus ZX3 makes a constant high pitched squeal while driving. Any ideas?
if you have had recent alternator, or anything attached to the belts replaced recently take it back, they incorrectly tightened the belt.
My 2001 Ford Focus ZX3 makes a constant high pitched squeal while driving. Any ideas?
It's probobly the fan, have it checked out buy your local ford dealer.
I had a 2001 Focus SE, had the same problem. Here is what they are going to tell you when you go to a Ford Dealership. %26quot;We're going to have to replace the intake clamp, rotate your tires and rotors, change your brakes, and realign your wheels. We also may have to replace some 'durtee durtee durr' sensors and 'durtee durtee durr' your cars computer..%26quot;



The 2001's all sucked, I got rid of mine, and got an Escape. When they resold my Focus, guess what, the same thing to that guy.
sometimes that noise it's making can be caused by the tensioners or the water pump itself what i reccomend is to

take the belt off and inspect for wear if the tensioner is the one making the noise it will be worn possibly will also have rust looking material around bearing.
belt must be centered on pulleys,wrong belt,bad tensioner
I have seen a miss placed plastic splash shield cause it. Rubs against the crank pully. As well as the tensioner pully.

I have also seen backing plate on the front brakes rubbing the rotor cause it.
In addition to checking the pulleys, the PVC elbow (the 90 degree piece of rubber on top of the PVC valve) had a tendency to deteriorate due to age and heat. When they develop a small hole, it acts like a reed valve, emitting a high pitched squeal at certain vacuum levels. It kind of sounds like a balloon that a young boy is letting the air out of at parties to annoy the adults.