Drive belt "squeal" is most commonly caused by "slipping." Usually, properly adjusting the belt TENSION will correct the problem. If this does not correct the problem you can try removing the belt altogether, and "reversing" it, and then reinstalling and properly adjusting the tension. If neither of these fixes correct the problem, I would next, replace the belt with a new one, being very careful to properly adjust the tension. If that does't work, it appears [unfortunately] that there is probably a MISALIGNMENT of one or more of the pulleys driven by the belt. If that's the situation, I would recommed taking the vehicle to a good, well qualified MECHANIC.
Spray hairspray on the belt if it is making the noise or replace the belt or the pulley if its making the noise.
you may have leaves in the fan
Your air conditioner may be making a loud squealing noise because the AC compressor, which helps cool the air, could be malfunctioning. This could be causing the noise you are hearing.
if the noise is a high pitched squealing noise, the belt is slipping....if the noise is a whine or growling noise, the pump is low on fluid or the pump is bad
A whistling noise indicates a vacuum leak.
If the power steering pump is making a whiny noise on a Pontiac Grand Prix, the way to tell if this noise is from the pump or another source is to turn the steering wheel. If it turns hard, the problem might be with the pump. If the belt quiets down after a drop or two of dish soap is placed on the belt, then it was just the belt causing the noise.
The u-join is probly going out
A worn belt will cause a squealing noise. The squealing noise is caused when the belt slips. Tightening the belt will temporarily fix the problem.
WD40 applied at appropriate places.
If your AC unit is making a squealing noise, it could be a sign of a belt issue or a problem with the fan motor. It is important to turn off the AC unit and contact a professional HVAC technician to inspect and repair the issue to prevent further damage.
It could be low on power steering fluid. That is a common problem. It makes a sharp whining noise when you turn the steering wheel.
The squealing noise in your car when the AC is turned on could be due to a worn-out or loose drive belt. The belt may be slipping or not properly tensioned, causing the noise. It is recommended to have a mechanic inspect and possibly replace the drive belt to resolve the issue.