Noisy Engine on CLK

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Burton Stuttman - 14 Jul 2009 19:50 GMT

I've got a 2007 CLK550 that emits a loud whining noise whenever I cold start
with the A/C on. Once the engine warms up and the A/C slows up a bit the
whining decreases. I've asked the dealer about it but they just shrug it off
& say it's normal. It's difficult to demonstrate as whenever I'm at the
dealer the engine is warmed up and doesn't exhibit the excessive noise. I
would appreciate any advice as to what's causing the noise.

Bstuttman

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Cordy - 15 Jul 2009 10:13 GMT

Burton Stuttman ha scritto:

> I've got a 2007 CLK550 that emits a loud whining noise whenever I cold start
> with the A/C on. Once the engine warms up and the A/C slows up a bit the
[quoted text clipped - 4 lines]
>
> Bstuttman

Maybe it's just the belt that's sliding. Checking correct tension and/or
exchanging belt (check tensioner, too) might be the solution. Belt: I
mean the belt that transmits engine rotation to the A/C compressor.

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Tiger - 15 Jul 2009 14:53 GMT

I haven't seen that engine yet but I would have to say it is the idler
pulley... the wheel that just spins. It is most likely attached to the
tensioner or independent and regardless of which... the pulley itself is
replaceble.

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