Q&A for How to Quiet a Noisy Fan Belt

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  • Question
    Why does my fan belt squeal when I start my car?
    Duston Maynes
    Automotive Repair Specialist
    Duston Maynes is an Automotive Repair Specialist at RepairSmith. Duston specializes in leading a team that handles a variety of automotive repairs including replacing spark plugs, front and rear brake pads, fuel pumps, car batteries, alternators, timing belts, and starter motors. Duston holds an Associate’s degree in Automotive/Diesel Technology from The Universal Technical Institute of Arizona and is a Certified Diagnostic Technician and Automobile Mechanics Technician through BMW STEP. RepairSmith received The 2020 Big Innovation Award by Business Intelligence Group and The Startup of the Year by the American Business Awards. RepairSmith was also included in Built in LA’s 50 Startups to Watch and The Business Intelligence Group’s 52 Names Leading the Way in Customer Service. RepairSmith offers in-home services to provide car owners convenient and complete auto repair everywhere.
    Automotive Repair Specialist
    Expert Answer
    The belt tension might not be good enough, a pulley might be binding, an aged tensioner might be causing a slip in the belt, or oil on the belt might be forming an oil leak. Stop by a local shop to get your vehicle properly diagnosed.
  • Question
    Can a misaligned belt cause any serious damage, other than the annoying squealing?
    Logic Johnson Lafontaine
    Top Answerer
    No serious damage, but your belt probably won't last as long as a well aligned one, since there`s going to be some unnatural stress on at least one of the grooves.
  • Question
    Is there a warranty on a driving belt and pulley of secondhand car?
    Community Answer
    Most states have 'as is' rules - when you purchase a car, you get it in the condition it's in with no warranty whatsoever, unless otherwise specified in the contract or bill of sale.
  • Question
    Will something else work other than belt dressing?
    Community Answer
    There is a number of things that would work, like soap, wd-40, or baby powder. These are only temporary fixes, though, so the noise will return.
  • Question
    When should a timing belt be changed?
    Community Answer
    Check with dealers of your brand. Some are about gone after 50,000 miles; some longer. If you have an "interference" motor and the belt breaks, the pistons can hit the valves and destroy your engine. My friend got really lucky, his had a bent pushrod - all of $2-3 fixed it!
  • Question
    How can I tell if my fan belt is expensive?
    Community Answer
    Call a parts supplier and tell them the year/make/model/engine of your vehicle and they can tell you. You can also look it up online and do your own research.
  • Question
    Will soap quiet the belt?
    Community Answer
    Yes, it will as a temporary fix, but it's recommended that you replace the belt or determine why the noise is happening as soon as possible.
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