A friend of mine has a 300E w124. I was in the car the other day and asked him what the humming noise was. What noise he said. I guess hes got used to it. It appears to come from the front of the car around the glove box area. It was too cold to open the hood and delve deeper. Any ideas. Maybe a fuel pump? Even when the ignition is on (engine not running) you can hear it.

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88 300CE 300,000kms
Black Pearl, Burgandy Leather
Euro Lights.
Its for sale. Its SOLD

Could be the auxillary water pump -- this time of year it runs a lot.

Need to check the current draw if you can hear it -- if it locks up it will fry the pushbutton control unit.

It could also be the interior temp sensor fan -- if so, you hear it because the foam hose under the dash has fallen apart and needs to be replaced. Temp control will be iffy if this is the case -- swing hot, then cold, then hot, etc.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

Its the interior temp sensor fan, that sucks air via a tube that runs up the pass. side windshield piller, and goes to the overhead console where the sunroof and light switches are located.

Over time they can be noisy, but most MB users get used to it, and do respond with, "what noise"?

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K

Yes, What Noise?

Hey, AMG, what's wrong with your speedometer? It's pointed way around to the right!

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2012 E350
2006 Callaway SC560