Every time I would turn on my A/C or heat, and i would give the car gas it would make this terribly loud screeching sound like a belt. I had a bunch of the belts replaced and it still does the same thing. What could be causing this loud scrreching sound?

 

Well it can be the pullies or nees oil bro check the oil in the ac compressor or check if ur pullies are shaking a lil I had the same problem easy cheap fix

 

For whatever reason, I've found these belts to be fairly finicky when getting them tightened just right. Chances are, they simply need a small adjustment.

 

I had the same problem. Mine was the pulleys. The stock pulley has a rubber piece to help with pressure from the engine if you understand what i am saying and mine orginal pulley with the rubber compltely woreout and the outside metal piece would spinb at a different rate the engine was spinning i had to get a new pulley