Very loud squeaking

I would suggest taking off your serpentine belt and by hand spinning the alternator , ac , water pump and any other pulleys to check for bearings going out . If they all spin freely start your car and see if problem persists . Do not run for too long since your water pump will not be circulating water this way .

I'm not sure where these other guys live but their solutions are nonsense. Coolant leaks? Fuel pumps? Dead or dying batteries? I too drive a 05 Scion xB and have had squeak issues. These squeaks and squeals are caused by one or both of the serpentine belts. If not the belts then the pulley's associated with the belts. One of the belts drives the power steering and the other operates the Alternator, Water Pump and AC Compressor.
Does your car squeak when you have the AC turned on and the fan running fairly fast?
Do you hear a rough kind of noise when you're turning the wheel? If it's either or those two then I'd check your belts.
But still to be on the safe side I'd bring it to a mechanic and have them check the belts for glazing or wear then go from there. If you can put belts on yourself they will run you about $40 for the pair. Most garages charge an arm and a leg for them and then another appendage to install them.

Best of luck

A squeal is almost ALWAYs a bad tensioner, worn idler, or a worn belt. Read this post to determine which

http://ricksfreeautorepairadvice.com/fix-serpentine-belt-noise/
Fix serpentine belt noise Ricks Free Auto Repair Advice

Check your tensioner pulley -- if you do not have enough tension on the serpentine belt, it will slip on the pulleys and cause a squeaking noise (very loud and high pitched). if you push on the serpentine belt with your hand, it should not more more than about an inch -- if it does, you are low on tension. If it does not have any give at all, then you have too much tension, and one of your pulleys might not be turning properly, causing that same noise. If your tension is right, and your car is still making that noise ... and belt dressings (the spray you probably used) are not working to stop it, then it might be a piece of rubber stuck on one of the pulleys, but this usually will not make that sound ... just smoke and a burned rubber smell.

Sounds like your alternator died.

it sounds like your a/c clutch,alternator or one of the components is ceazing.If you have the sepentine belt on it.check your serpentine belt first.

Have your hubby take the belt off and turn the pulleys by hand to make sure the idler pulley, a/c pulley, power steering pulley, and the alternator pulley all turn reasonable free and without binding. This is the easiest way to see what's binding and causing the belt to squeal. Another thing is to check alignment of the pulleys to make sure they're all on the same plane. If not, the pulleys will squeal the belt. Most likely a pulley that's the culprit..

It does sound like the alternator, plus it's possible the squeaking could be coming from that or possibly the serpentine belt. If you take the alternator to Autozone, whether it's on the car or seperate, they can test it for you for free. If this helps please rate this. Thanks

Shortly after replacing the serpentine belt in my lancer, the same thing happened. It is NOT the timing belt. Belts squeal when they slip. If your timing belt slipped it would cause your car to run funny.

have somebody check the belt for wear (or do it yourself), replace if necessary. If it doesn't need replacement, just tighten it.

If you have the 4cyl engine that I have, the tightening is kind of a pain in the ****. Not a great design by mitsubishi. There's a pulley near the front right corner of the engine in front of the alternator. the belt should be running around this pulley GROOVE SIDE OUT. This is the tension pulley.

To tighten:
1) Lightly loosen the bolt in the center of the pulley (slightly loosen, DO NOT REMOVE).
2) Under that pulley there's another bolt. You can see that the bolt goes through a piece of metal
attached to the back of the pulley. Figure out which way you need to turn the bolt to move the
pulley toward the front of the car. (i don't remember if it's right hand thread, or left hand) This
puts extra tension on the belt. You probably don't need much. Over tensioning the belt can
cause pulley bearing failure. If you haven't done this work before, ask someone for
help. It's better to tighten a little bit, a few times rather than overtighten once.
3) Don't forget to ReTighten the bolt in the center of the pulley.

If there's lots of cracks and pieces missing on the ribs or grooves of the belt you should replace it first.

Happy repairing,
Cliff

It is either your serpentine or another belt such as an alternator belt causing the squeak.

This can be resolved by either replacing the belt or making sure the tension is correct.

If it is a serpentine then replacing it will be necescary if it is alternator belt there are ways to tighten it.

Belt dressing is another temp fix for the squeal. the belts become glazed over time and will squeak and chatter spray some belt dressing on it and the squeak will go away for a while.



How loud is the squeak? 1-10