vacuum or air intake hose leaking or disconnected or loose...? good luck:)
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.
The head gasket is about to blow.....Typical ford..
Sorry forget to mention it in the motor.
Your brake booster is malfunctioning
If it it shutting off because of the hissing, it is likely moisture getting at electronic parts and shorting them. The hissing would be caused by cold water contacting hot engine parts. If the hissing is only heard after YOU shut off the car, it is likely a small leak in a vacuum hose. These are usually easily fixed.
Check your steering pump to see if you need to add more power steering fluid.
A ceiling may produce a whistling noise due to air leaks or drafts, often caused by gaps around windows, doors, or ductwork. When air moves through these openings, it can create turbulence, resulting in a whistling sound. Additionally, changes in temperature or pressure can cause materials in the ceiling, like ducts or vents, to expand or contract, contributing to the noise. Regular maintenance and sealing of air leaks can often reduce or eliminate these sounds.
I would think that you have a leak in your exhaust system.
Brake booster problem?
wind interaction with the stiff radio arial ?
Vacuum brake booster is defective or the hose going to the booster is leaking.