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Stan
Stan, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3526
Experience:  Technical support engineer
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Hi i have a mercedes c200 blue-cy exec secdi a 2011 diesel

Customer Question

Hi i have a mercedes c200 blue-cy exec secdi a 2011 diesel
Sometimes as im driving the engine makes a very loud humming noise ( sounds like a small aeroplane ). ! Im in cyprus in 35 degrees heat with the aircon on so i turned off the aircon thinking its that but still makes noise. When im driving its very loud. When car stops at lights then you can hear noise declining. Took it to a garage here and they said it must be the blower. What does this mean and what should i do ??
Would appreciate expert mercedes advice
Thanks
Submitted: 2 years ago.
Category: Mercedes
Expert:  Shantal-Mod replied 2 years ago.
Hello,

I'm Shantal and I'm a moderator for this topic.

I've been working hard to find a Professional to assist you with your question, but sometimes finding the right Professional can take a little longer than expected.

I was checking to see if you had already found your answer or if you still need assistance from one of the Professionals.

Please let me know if you wish to continue waiting or if you would like for us to close your question?

Thank you,

Shantal
Expert:  Stan replied 2 years ago.
Hello,
The engine and air conditioning cooling fans will make a lot of noise in the 35 degree heat, that is normal. I would recommend to make a test drive with a workshop foreman or technician so that they could also hear the same noise in driving situation. If they confirm that the properly running fans and blowers are causing this- you have nothing to worry about.
Also, there should be no fan noise when the engine is started from cold with AC off.
Fans only work when engine temp is above 80 degrees and AC is on
Regards,
Stan
Customer: replied 2 years ago.
Thanks for the info. Just to clarify that sometimes there is a noise when started from cold even with aircon off.
Not always though !
Any ideas why?

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