A whistling noise indicates a vacuum leak.
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.
Sorry forget to mention it in the motor.
vacuum or air intake hose leaking or disconnected or loose...? good luck:)
I would think that you have a leak in your exhaust system.
wind interaction with the stiff radio arial ?
Brake booster problem?
I have found that the noise that you are hearing are due to a belt adjustment that your car needs to have done - that is if you have a 2006-2008. Mine is making that noise but the dealer that I got it from are having a hard time reading the tsb on it so that they can properly fix the noise.
It depends on what organism is hearing the noise. For us humans, that would be 0 decibels.
A vacuum leak usually from the intake manifold gasket or brake booster hose/connection will cause a whistle upon partial acceleration. It will usually go away when your foot is off the gas or when more throttle is applied.
What would cause a grinding noise after a tire is replaced and the brakes are not worn?
voluntary, you cause your lips to form the shape to whistle, and cause the air to be pushed out. if whistling were involuntary, you would do it without making an effort (like your heart pumping, digesting things, etc)