no
Belt too tight, or too loose, or drive pulleys out of alignment, or damaged.
no
The belt(s) are probably too loose or too tight. Either way will cause noise.
It won't work being too tight or too slack.
The serpentine belt and the tensioner on a 300 SE motor is part of the fan system that controls all of the smaller motors on the front of the engine. The serpentine belt helps turn the alternator, power steering pump, water pump, and the fan. The tensioner is a pulley on this belt that helps to keep the belt tight enough to stay on, but not too tight to hinder operation.
because its too tight
the belt may be too tight, you should be able to grab the belt and twist it around half way if you can't do that its too tight.
Your car most probably has an automatic belt tensioner that keeps the belt tight and in proper spec. If the belt has too much play in it, the belt tensioner will need to be replaced.
It Could Be Your Serpentine Belt too tight or not tight enough.
You can wear a belt. Just do put it too tight.
The belt cover may have been installed incorrectly and either the belt or crank pulley could be hitting it, the belt may have been installed too tight or incorrectly also.