This sounds like the AOS - air oil separator.
Your AC unit may be making a whistling noise due to a clogged air filter, a refrigerant leak, or a problem with the fan blades. It is important to have a professional inspect and repair the unit to prevent further damage.
A whistling noise in your toilet may be caused by a faulty fill valve or a worn-out flapper. This can lead to water leaking and causing the noise. It is important to fix this issue to prevent water wastage and potential damage to your toilet.
A whistling noise indicates a vacuum leak.
Your air conditioner may be making a whistling noise due to a blockage in the air filter, a problem with the fan blades, or a leak in the ductwork. It is important to address this issue promptly to prevent further damage to your air conditioning system.
A chirping whistling noise!
There are many causes of such whistling noise coming from a motor. These includes but are not limited to:A broken brusher rubbing against the commutator.Loose bearingsA damaged armature winding rubbing against the field windings.
A bad compressor belt can cause a whistling noise while running the air conditioner. A bad engine can also cause this noise.
whistling noise from engine will be caused by a leaky gasket,sucking air. this is usually the intake manifold gasket
The noise is caused from lime and rust build up inside the shower head. Soak it for 24 hours in CLR - that should work.
dog whistling
Vuvuzela and police whistling noise of loudspeakers and people
The most common cause of the whistling in a 2003 Impala is a vacuum leak. Any of the lines under the hood could be causing the noise.