A whistling noise indicates a vacuum leak.
A bad compressor belt can cause a whistling noise while running the air conditioner. A bad engine can also cause this noise.
One of the hookers in the trunk, mabie. Or your past-out drunk buddy.
possibly on of the belt pulleys or a vaccum 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.
check the fluid in the power steering pump
The head gasket is about to blow.....Typical ford..
It is probably the cover for your catalytic converter.
Replace the Harmonic balancer
A chirping whistling noise!
Some times the impeller blades get bent into the housing causing noise
newdiv vacuum leak, cat. converter comming apart, exhaust noise
You have a vacuum leak somewhere. Check the orfice line.