Hi all, C250TD 1998 model.
It has developed a humming noise at speeds above about 30mph which gets louder the faster you go. It's something on the rolling gear as it makes the same noise when coasting. It does not sound like a wheel bearing rumble but more like very loud tyre noise (it's not tyre noise, they are fairly new) or bad road surface kind of constant hum.
Any ideas what could be casuing it, it sounds like it's coming from front of car but hard to tell exactly as the noise fills the whole car!
It has developed a humming noise at speeds above about 30mph which gets louder the faster you go. It's something on the rolling gear as it makes the same noise when coasting. It does not sound like a wheel bearing rumble but more like very loud tyre noise (it's not tyre noise, they are fairly new) or bad road surface kind of constant hum.
Any ideas what could be casuing it, it sounds like it's coming from front of car but hard to tell exactly as the noise fills the whole car!