Belt Squeal at startup and until engine warm
Thread Starter
Senior Member
Joined: Aug 2010
Posts: 329
Likes: 28
From: Virginia, USA
2005 c230
Belt Squeal at startup and until engine warm
Yes, ive searched, and do understand that this may be a common issue. Belts are less than a year old as is the tensioner and a couple of pulleys and the water pump. After replacing all of these, all was quiet. Then about 3-4 months later, noticed on startup (especially on colder mornings) there would be a noticeable squeal. Car runs great/fine, but the squeal is annoying. Engine is totally stock, but the way. Found this video. Wondering if this is the solution? (aftermarket belts).
Any input is appreciated.
Any input is appreciated.
Thread Starter
Senior Member
Joined: Aug 2010
Posts: 329
Likes: 28
From: Virginia, USA
2005 c230
Thanks. When its squealing, if I slowly pour a small amount of water directly onto the serpentine belt itself, the squealing stops completely. (temporarily). This indicates that it's a belt issue, not pulley.
Senior Member
Joined: Sep 2017
Posts: 499
Likes: 66
From: N.Y. L.I.
04 E55 AMG BLK/BLK(MyDD), 06 CLK 500 (wife's) 07 ML500, 2012 C300(son's)
IMO; If you want to check pulleys, water pump, A/C , P/S ect... remove serp belt and rotate them by hand.
Thread Starter
Senior Member
Joined: Aug 2010
Posts: 329
Likes: 28
From: Virginia, USA
2005 c230
https://www.cartechbooks.com/techtips/serpbelt/
Belt noises can be diagnosed with a spray bottle of water. With the engine running and the sound audible, lightly mist the grooved side of the belt with water. If the noise disappears or lessens, but then shortly returns, the problem is probably a misaligned pulley. If the noise immediately increases after the belt is misted, the belt is slipping.
https://dayco.com.au/pageBANK/docume...bottletest.pdf
Belt noises can be diagnosed with a spray bottle of water. With the engine running and the sound audible, lightly mist the grooved side of the belt with water. If the noise disappears or lessens, but then shortly returns, the problem is probably a misaligned pulley. If the noise immediately increases after the belt is misted, the belt is slipping.
https://dayco.com.au/pageBANK/docume...bottletest.pdf
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Senior Member
Joined: Sep 2017
Posts: 499
Likes: 66
From: N.Y. L.I.
04 E55 AMG BLK/BLK(MyDD), 06 CLK 500 (wife's) 07 ML500, 2012 C300(son's)
lightly mist the grooved side of the belt with water. If the noise disappears or lessens, but then shortly returns, the problem is probably a misaligned pulley.
Fascinating
But I'm still pulling the belt and checking everything by hand
Last edited by Pmarino; Oct 24, 2019 at 10:27 AM.
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Super Member
Joined: Oct 2018
Posts: 699
Likes: 75
From: OC, CA
2006 E55
Had the same issue with cold starts with squealing noise that’s annoying and embarrassing but stops when engine warmed up. My fixed was the serpentine tensioner and issue resolved after changing it.
