2004 Mercedes-Benz C240 4MATIC Q&A

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

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. -
Answer 1
check your fluids. if you have low coolant or oil that could be your engine knocking. -
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