The belt should have about half an inch of play for appropriate tightness. If there’s a manual tensioner on the car, make sure that its tension is correct. It’s possible that the spring has weakened. If that doesn’t work, replace the belt tensioner. If you have one of those, and if the adjustment is wrong, then it may be stuck. The tensioner on some cars has springs, so you don’t need to manually adjust it. The problem may be as simple as the wrong tensioner adjustment. Fluid contamination on the belt (motor oil, power steering fluid, antifreeze, etc.).If you find that the belt’s path isn’t correct, you can reinstall it.If the belt’s path is correct, and if you’re still hearing noises, then the problem may be: Use it as a point of reference while inspecting the belt’s path. The guide will tell you which way the belt should be installed. It should be inside the engine bay (near the radiator) or on the hood. The first thing you want to do is to look for the belt installation guide. It’s also possible that the belt is too long. It’s possible that the belt and all the parts are in good shape, but the belt wasn’t installed the right way. Mistake With The Belt Installation Or Tensioner Adjustment To remedy this issue, you can replace the accessory. If you hear a chirping or squealing noise, you’ve found the part with the bad bearing.Put your ear to the other end of the screwdriver and then listen.Be sure to touch only an area that’s not moving. Put the metal end of the screwdriver on the part you think may have a bad pulley bearing.If you suspect that a worn bearing is the cause, here’s a neat old school mechanic trick to try: If the pulley shaft wobbles, this throws the belt alignment out of whack. If the bearings partly seize, the belt slipping over the pulley will cause squealing. When this happens, they usually either partly seize or allow the pulley shaft to wobble. This problem is more likely if you’re working on an older car. If you determine that a misaligned tensioner or pulley is the problem, replacing it should do the trick. The tensioner arm moves smoothly through its entire range of motion.The pulley turns freely without binding or wobbling.If you have an automatic belt tensioner, make sure that:. ![]() Make sure that all the pulleys and brackets are properly tightened to the mounting surfaces.
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