I have read many many posts about belt squeals but I have read nothing new to help solve the squeal my car is making. I have replaced the idler and tensioner pulleys. I just put a new dayco belt on-the best one they had available hoping that would solve the problem. What could be causing my car to make this LOUD squealing noise? It gets louder when I accelerate and seems to be worse when it is cold outside. I am against using "belt dressing" on the belt-I know the problem is far beyond using some belt dressing. I also dont want to take my car into the shop because if I can figure out what is causing the obnoxious squeal I could more than likely fix it. It is very hard to pin point where the squeal is coming from-my dad has a stethoscope which we still cant hear where the noise is coming from exactly.