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2004 Mercedes-Benz C240 4MATIC Question: What can this issue be?

 

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Alvida, Charlotte, NC, March 06, 2013, 07:23
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At first It started with clicking noise from vents when heater or air was turned on. Now all of a sudden without warning a loud knocking from under the hood.

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  • Answer #1

    March 06, 2013, 09:16
     Rookie

    check your fluids. if you have low coolant or oil that could be your engine knocking.

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