Car Sounds
Ford Escort ZX2
Noise Pollution

What would cause a squealing noise when the ac is turned on?


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Answered 2006-09-23 05:36:07

check a/c compressor and belt.


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When refilling the oil some may have dripped onto the belt which would cause it to start slipping badly and squealing loudly.

It sounds like the fan-belt is slipping.

possibly a bad should get all brakes done

If that's the extent of the complaint, check the serpentine belt and tensioner.

the cv axle wasnt completely tightened causing the hub bearing to go out

Though there are several possibilities, by far the most common reason for that is a loose or glazed belt in the engine compartment.

Start with the most likely andeasiest to fix. Check your brake pads... There is a wear indicator on the inside pads (closest to engine) that will rub on the rotor and make a squealing noise to warn you that the pads are getting thin. When you apply the brakes the noise will go away a lot of the time. If the pads are new or not making the noise then I do not know what the problem may be.

I think it is the massive pressure of the water being let out at such fast speed that it makes a squealing noise

May be nothing more than compressor belt is slipping or A/C compressor may be getting "tired" an may soon need replacement

If it's a manual transmission, it might be the throwout bearing. However, this noise would only occur with the clutch pushed in. If it does it after you let the clutch out then it might just be an accessory belt that needs tightening.

A loose or glazed "fan belt" is a very common cause of squealing. A quieter squeal is produced by brake linings that are almost worn through.

If the squealing noise is coming from the drive belts, perhaps they need to be replaced or one of the accessories has bad bearings and is seizing up when it gets hot.

Depending where the noise was coming from, but this question is most likely to be answered in this way. If you switched a valve off and the noise was coming before the valve in the pipes, that would indicate a burst pipe.

What would cause a grinding noise after a tire is replaced and the brakes are not worn?

why is there squeek noise when starting and then goes away when engine warms up

The A/C system compressor operates when in the defrost mode. If the noise is also heard when running the A?C it is more than likely a problem with the compressor/pulley.

The whining noise in our 2001 2.2 cavalier turned out to be the a/c compressor. It ended up going out at about 120,000 miles. I would suggest having it serviced. I wish we would have had ours serviced.

Possible its time to change those brake pads out. The whining noise is possibly the metal grinding to your rotor, which would cause your wheel to shake. Consider getting those rotors turned as well.

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