To start with iam a qualified mechanic so i should know what im talking about. I own a 04 plate Astra with a loud whistling noise coming from the engine after being run for 20 mins or more. the engine code is XEP (the water pump Does Not run off the timing belt). If the main breather is disconnected from the back of the rocker cover the noise stops immediately. The cause of the noise is excessive negative pressure in the rocker cover and crankcase. Another way to check is to remove oil filler cap and if excessive vacuum is felt then the only course of action is to replace the entire rocker cover assembly. Rough cost - £115 + vat Inside the rocker cover is a plastic valve and diaphragm that is the cause of the noise. Unfortunately this can not be replaced independantly. Hope this is of some help
Could be stone in tyre
whistling noise from engine will be caused by a leaky gasket,sucking air. this is usually the intake manifold gasket
you are about to crash man! turn!!
A whistling noise indicates a vacuum leak.
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.
If the whistling noise is coming from under the hood its your belt, that's what's wrong with my Sequoia. If its not coming from under the hood its probably a crack in the seem of your window.
A chirping whistling noise!
The rattling and whistling on the 94 Explorer sounds like an exhaust problem. Check the exhaust for any leaks or loose connections.
A bad compressor belt can cause a whistling noise while running the air conditioner. A bad engine can also cause this noise.
A whistling noise coming from the shower faucet or when filling the bathtub could mean that there is excess air in the water line. This can be fixed by turning off the major water supply valve and then opening all of the faucets in the home for about 5 minutes. Shut all of the faucets off, then turn the water supply back on.
The most likely cause of the whistling noise is loose or worn weather stripping around the door. If this is the case, the sound heard is the wind.
Perhaps a vacuum leak?