Squeeling while in motion. cannot reproduce while sitting. belt looks good.

Change the belt and check for bad bearings in the Alternator pulley and all the other pulleys that the belt rides on sounds like it could be dragging causing your belt squeal or your belt is worn too good luck.

wrong belt or wrong routing for belt, even though belt looks good it could be burnt causing slip which causes squeel.

This is often only a slipping belt; try to rev the engine (jab the accelerator briefly) while standing to see if the squeal is present. If it is, it is a drive belt for either water pump, AC or other device. Check the belts for cracks; if they still look good, find the adjustment for belt tension and adjust accordingly.

The squeeling is the belt because the air compresor is likely seizing. At idle it can't turn the compressor, in motionthe compressor probably turns and cools the air. Most air conditioners come on when the defroster is on.

Try replacing belt.

It's a loose belt for sure.

If you have a spring loaded tensioner, and the belt has stretched with time, the tensioner will reach the limits of its travel without tensioning the belt enough to prevent that squeal.

If it has an adjustable tensioner, tighten the belt up.

there is no way of manually tightening the belt. if the belt is loose you need to look at the tensioner and see if it is sitting at an angle. if it is, it needs to be replaced. this item is on the more left side of the engine as you are looking at it and will be about 6-7" long with a 3/8" hole near the end so you can use a ratchet pull away from the belt. if its squeeling youre hearing first check for glaze and cracking. next check for writing on the belt and you should be able to read it like holding a book. if it is upside down to you, take it off and turn it around. this definately works.

no the likely problem is the tensioner itself

I would say that there is a bearing going bad either the alternator, waterpump, or idler. You should take off the serpentine and check the smoothness of motion of anything connected. What happens is that the bearing gets rougher and rougher adding more torque needed to turn. This in turn wears the belt and causes the squeeling. The squeeling is nothing more than the belt turning on the pulley without the pulley moving the same speed. In otherwords slip. This action wears the belts quite quickly.

This is not a symptom of a timing belt, but remember timing belts are only good for 60K miles and when on of those goes - so does the engine, especially if it has a over lapping piston valve clearance. So do this as regular maintenance.

A good test is to take off the serpentine and then run the engine, all should be quite. The check each connected item till you find the rough bearing and replace that accessory or change the bearing on the old.

I think the part was always bad, it just gets worse over time, and the belts get looser as they wear against the pressure - thus the noise.


Regards,


Doug

Hello,
I can't tell exactly what it is since I cannot hear it, but in most cases it's a belt. Check that first, or have a friend help you - one of you can start the car and the other one can look under a hood to search for the squeeling part.