A bad compressor belt can cause a whistling noise while running the air conditioner. A bad engine can also cause this noise.
I had that problem in my1998 CR-V and took it to a mechanic... Was told that my ac compressor was freezing up. And that if I kept running my ac it could cause lockup.
A bad thermostat can cause overheating in a Nissan Frontier when the air conditioning is turned on. A bad compressor can also cause this.
Air conditioning.
Could be your ac compressor is going or gone, probably gone.
This could mean your pump bearings are going bad.
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.
It could lead to it indirectly.
check the power steering fluid level and belt tension.
One of the hookers in the trunk, mabie. Or your past-out drunk buddy.
If this a split system, indoors and outdoors, and the outdoors unit appears to be running I suspect that you have a problem with the compressor. Maybe you have a leak and lost our refrigerant. Either of these can cause this symptom. Both require sophisticated repairs.Regards.
If the house is changing its temperature, different structural elements will expand or contract at different rates, causing friction and consequent noises which can be quite loud. This is particularly true in basements.
Is it a "whistling" or a high pitched squeeling sound? If squeeling, it could be the signal that the front brake pads are in need of replacement.