does it stop after some time? it could be just the radiator Fan, it's fine, if it didn't spin right, your engine coolant would accumulate heat when the car is stopped because there would no air flowing through the radiator to drain the heat. since it stops when you move, it sounds like that's it. If it really runs constantly when you're not moving, you might want to have your radiator cleaned or changed or maybe yours is just meant to act this way, but it could be a sign of an inefficient Radiator. mine stops after about 10 seconds of spinning for example, but it's almost brand new.
Is it a "whistling" or a high pitched squeeling sound? If squeeling, it could be the signal that the front brake pads are in need of replacement.
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Sorry forget to mention it in the motor.
A partially blocked airway may produce a high-pitched sound called a STRIDOR.
Wheezes - continuous high-pitched whistling sounds produced during breathing
cat-calling is when a person, usually a constuction worker, tries to get a woman's attention. They usually do so by whistling high then low pitched.
Fan belt slipping
If you mean a high-pitched screeching or whistling or zipping sound, they're probably slipping. New brake pads?
This could mean your pump bearings are going bad.
usually loose belts.
It fits inside your muffler tip and uses the exiting air pressure to produce a high-pitched whistling sound, but does not have the same auditory pattern of a true turbocharged vehicle.
You can get a humane bark control collar. These collars do not use shock or trauma to controll your dogs barking. Instead it uses a high pitched whistling noise. You can find them about anywhere, even on amazon.