Deep humming sound from rear of W202, normal??

[240-singh]

Hi guys. I posted a topic earlier regarding a humming sound i'm hearing and thinking it was something to do with the AC. But now im very sure its not the AC as i have had it off for the past day. Im hearing what can only be described as a fan which is turning on and off every now and again and its comming from the mid section/rear of the car. Its a pretty deep "hum" and lasts for about 2 minutes. probably occurs twice on a half hour journey. I would just like to know if this is normal or not as i dont want to cause more damage by keep driving it. Its a 1999 C240 sport.

Thanks.

 

[television]

This could be the electric fans cutting in, they come on at 100c and do not stay on that long normally

 

[Alps]

sounds like fuel pump?

 

[Dieselman]

sounds like fuel pump?

I agree.

 

[240-singh]

sounds like fuel pump?

yeah it sounds like its comming from that area. but it sounds pretty loud for a fuel pump. could it need replacing?

 

[BlackC55]

Either replacing or the rubber mounts are past it. Also the braclet could be bent and rubbing on the cars underside. Have a look underneath and remove the plastic covering (right hand side).

 

[BlackC55]

Either replacing or the rubber mounts are past it. Also the braclet could be bent and rubbing on the cars underside. Have a look underneath and remove the plastic covering (right hand side).

Bracket......whoops

 

[vijilants]

Change the fuel filter first.....usually a clogged filter makes the pump overwork.

 

[nick mercedes]

Hi guys. I posted a topic earlier regarding a humming sound i'm hearing and thinking it was something to do with the AC. But now im very sure its not the AC as i have had it off for the past day. Im hearing what can only be described as a fan which is turning on and off every now and again and its comming from the mid section/rear of the car. Its a pretty deep "hum" and lasts for about 2 minutes. probably occurs twice on a half hour journey. I would just like to know if this is normal or not as i dont want to cause more damage by keep driving it. Its a 1999 C240 sport.

Thanks.

Wheel bearing?

 

[Bazzle]

Handbrake shoes??

Bazzle