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Originally Posted by graham7773
I know everybody (with one or 2 exceptions) is trying to help but why would you put a lubricant on a drive belt when it needs grip to work properly? Just pull the belt off, turn it inside out and check for cracks or splits. If you find them, there is the cause of your noise. Replace. While the belt is off, check the tensioner and idler pullies for noise. Usually a mild grumble or squeal. Replace. Also check your water pump for free turning and play. Free turning is ok, play is not. While you are there, again, make sure the water pump spindle is not making any noise as well. I had one sieze on me and cost me a new pump and belt plus was finding bits of destroyed serpentine belt for months after all around the engine bay. Hope this helps.
I forgot to mention, alternators can make noise when they are on their deathbed as can air con compressors.
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i`m guessing your questioning the rubber grease, i don`t know scientifically what it actually does, all i know is a newish car would come in for a service , if it had a noisey belt, nothing the matter with the belt, tension ok, we`d put a smear of rubber grease on it, it would shut it up almost instantly, and as i said, you don`t put a silly amount on so it sits there doing a burnout, just a smear.