Screeches on start up - DeVille Cadillac Cars & Trucks

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I would just change the drive belts. They're inexpensive and definitely worth it.

The screeching is the belt slipping, two possibilities, either the belt is not tight enough, or you have fitted a faulty pump which is putting to much resistance on the belt? If it carries on screeching for any length of time it will break. Check your alternator belt tension, if you had to remove and refit that? Quick check for alternator belt is, switch on headlights, does the screech get louder? Don't over tighten the belts, this puts stress on bearings!

Are you saying the serpentine belt is screeching after the engine starts, or the starter is screeching when you are cranking the engine ?

Sir, I think you need diagnostic this car. I think just screeching sound, but maybe hide the big problem. http://www.chinasinoy.com/search/?q=mercedes+

The belt is slipping or the compressor and/or clutch is bad.
If the compressor won't turn freely with the engine off, it may be locked up which will make the belt screech.

No probably what your hearing is the belts slipping, they are probably getting oil on them from your leak and slipping.

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The high pitch sound may come from the brake pads as metal parts hit the disc to signal the owner that it needs change. The metal parts gets exposed when the pads have worn out. The brake also has a hub to cover the disc. See if the metal plate is hitting it but this issue would appear when the wheels are in motion. Check if it is the belts, have the tension checked out. Other than that the bearings are the other items on your wheel that could cause a high pitched sound when you car is in motion.

Remove the belt and check all pulleys for smooth operation. any binding at all is amplified when belt tension is applied. also check the belt itself...If it's glazed or dried out, it can be noisy.

I would guess that you have a stretched or loose serpentine belt. Common problem.