Question about 2005 Mercedes-Benz Mercedes Benz E320 Cdi

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Car started noise like nock ing that was from Clutch in AC copmressor

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It could be the compressor is going out, or the clutch itself is worn out. If the AC still gets cold, then it is the clutch.

Posted on Nov 14, 2009

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I don't think you will get any knocking from any ac compressor, you may hear loud clicking or squeal but not knocking. I would take it to any garage and any good mechanic can listen to the engine and tell you what the knocking is and if it knocking constant I would not recommend driving the car, it could be more serious problems which may damage your engine more. knocking can cause by bad piston rod or valve taping which can also sound loud like knocking.

Posted on Nov 14, 2009

  • kevin wright
    kevin wright May 13, 2014

    my S 500 made the same knocking sound just yesterday.my car wouldn't start for the first couple times now it starts but I don't have cold air

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