How do I stop my Serpentine Belt from “squealing?”?
wow so many bad answers here. You should never put any kind of belt dressing or any other type of lubricant on a serpentine belt. If you have a squeal then you either have the wrong size belt or you have a bad pulley normally the idler pulley goes bad. Do what you must but I can tell you from many years of experience that you will regret putting any type of lubricant on a serpentine belt. The main reason is that the belt rides on smooth pulleys and if it gets oily it can and probably will slip off. Also it will deteriorate the rubber that the belt is made of. Take the belt off and spin all the pulleys and I bet you will find a small squeak in one of them. That is the problem I am sure.
The serpentine belt, or fan belt, as some call it, transfers power from the engine crankshaft to the various engine accessories, such as the alternator, power steering pump etc. When the belt doesn’t maintain constant adhesion to the various pulleys, it begins to slip and squeal. Often, the belt squeal is caused by moisture on the ribbed side of the belt.
