rob37w

2008 - c300 4matic sport
65,000 miles
Major work - New front transfer case

About 3 weeks ago my car starting making a strange buzzing noise from 30-50mph. Like a small plane was flying over it. It seems to go away the more weight I have in the car. 2-3 passengers and you can barely hear it.

I took it to my Mercedes guy and he said it could be my engine mounts. He said they were very low. I hate to spend $500 to have them replaced if that isn’t the issue.

I was going to take it to local dealer but they charge $100 just to look at it.

Bosnia1992

What kind of buzzing ? can you make a video or a sound clip?


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rob37w

Too quiet to record. Just sounds like a small cesna plane is over me.

When i turn left it goes away and when i turn right it gets louder.

Bosnia1992

could be your power steering. out of warranty ?


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rob37w

i dont think so on the power steering

anything below 30 or above 50 and there is no noise. I can turn right or left out of the 30-50 range and i am fine.

Doanster

Sounds like bad wheel bearing(s) since it's speed and direction dependent.

rob37w

Looking like it is the wheel bearing. Anyone have a part number for the 4matic?

I cant seem to find the 4matic front left wheel bearing.

rob37w

Confirmed with local shop that it is the front drivers side wheel bearing. His price for labor seems to be high. What do you guys think?

Part - $80 (sounds right)
Labor - $400 (5 hours of labor)

Said he has to drop the steering collum to get to the bearing? What?