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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.
Does your car have air conditioning.? Most cars use the A/C compressor to dry the air for the defrost. It will also come on for a short time when you first start the car. With the engine running after the squeel has stopped , try turning the A/C on , If the squeel starts again , then I would think your A/C compressor is seized. Also . are you sure the 2 new belts are tight enough?
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.
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