Squiking noise on Sienna 2000

[Hola]

This noice happens from time to time when we turn on the air conditioning, does any one knows about this? When the noice comes on if we turn off the air condition the noice stops, it sounds like the belt is squicking.
Thanks

[toddman67]

Sounds like it's time for a new belt. When's the last time, if ever, was it changed?

[Hola]

That's what I was told by a mechanic when first started making this noice and the belt was replaced abuot a year ago, the noice still continued more spontaneously nontheless it stil continued. So, I don't think it has something to do with the belt.

[toddman67]

The next step involves the removal of the belt and inspection of the idler pulleys, tensioner pulley and the alternator etc. Briefly start the vehicle with the belt off to confirm that it is one of these components.
Check the belt for contaminates, cracks and so on to rule it out.

[ProMan]

If turning on/off the AC makes the noise stop, then it should be the compressor. But depends what kind of noise it is. If it's sharp squeaking, then it could be the belt. If it's metal to metal noise, then something is wrong with your compressor.

[Hola]

Thanks every one, it is not metal to metal squeaking noise, it's more belt noise. The pulleys problems makes sense since the belt was already replaced.

[pbarnrob]

You might try Belt Dressing, inexpensive fix to spray on. Usually used on alternator and other belts, when just a little too loose, or getting a bit old and stretched. Dressing renews the glazed belt surfaces, allowing them not to slip and squeal. Before spraying though, watch the belts and pulleys rotate. Anything wobbly? IIRC, there is an electric clutch on the AC hub; that also could need some lube.

[Rue292]

I have 2000 Sienna and having same problem with AC ON/OFF. Would you please tell me how did you fix this problem. Thanks in advance