A bad compressor belt can cause a whistling noise while running the air conditioner. A bad engine can also cause this noise.
If its a high pitch squealing while accelerating, then the previous owner may have turbocharged, or supercharged the engine.
check tension on fan belt(s)
It sounds like you need a new serpentine fan belt.
the squeeling noise is from the fan belt either the belt needs renewing, or the a/c compressor clutch is not operating correctly
No, this HP laptop should make little to no noise while running with no programs on.
It's going to be your radiator fan clutch. Mine was squealing for a while until finally it turned into clanging. It was pretty bad. I'm in the process now of replacing mine. That should be your next step.
loose fan belt, or low power steering fluid. Depending on the sound, it could also be the brake pad wear indicator.
Nine times out of ten it is a worn serpentine belt. Tensioners are also know to make a rattling noise congruently. Changing your belt and/or tensioner should solve your problem.
main shaft bearing
The kids in the back.
You probably have a bad bearing.