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I really need the year but here is what might be the cause, the engine cooling fan clutch may be defective, if it locks up you will hear a roaring noise that gets louder as the engine speed increases. Open The hood and rev up the engine does the fan make allot of noise, like an airplane propeller?
Oct 2, 2013 - I recently had new fan belts installed after hearing a high-pitched, ... Do you hear the noise when the engine is running and the vehicle ... Just replaced water pump (and timing belt) yesterday and squeal ... When driving it make a noise but change out and caught speed the noise is coming from driver side.Missing: 1999 plymouth breeze
You hear a high-pitched squeal that stops when you shut off your engine: Readjust or replace the belt. These belts should have about half an inch of play and ...Missing: 1999 plymouth breeze
I assume that you have a 6cyl engine, noise came from both worned secondary timing chain tenssioner shoes, just replace those two and while you have them all apart, also replace main tenssioner and guide, then all noises will go away. Good luck!
It still could be the throw-out bearing. When going bad, they have a high pitched whine or whistling, and if bad enough, could imitate a vibrating sensation. IDK, I would have a mechanic there listen to it.
Sounds like your serpentine belt is slipping try checking your belt tension with engine off if ok replace belt or purchse belt dressing spray at your local parts house.
There may be a small hole or cut in a vacum line or possibly just loose. Also make sure the air filter box and the big hose to it are secure and clamps etc are tight. Pulleys and belts can make a high pitch sound also.
I had a high pitch noise, didn't sound like it came from the "underside". Turns out it was one of fans that had little chips in the blades? My Audi dealer replaced it, and it's fine now.
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