Whine noise, BMW 330d?

Whine noise, BMW 330d?

Author
Discussion

PLuKE

Original Poster:

283 posts

190 months

Wednesday 14th November 2018
quotequote all
I am need of some advice on an issue that’s arisen.

My 2013 BMW 330d has started to make a very faint whine noise, related with engine speed and temperature. The car has 127k on the clock.

So on a cold to luke warm engine temperature I can hear a faint whine, mainly on de-acceleration around 1000-1300rpm but also on a light throttle, say in a car park. It makes no difference on the load, A/C, heater etc. Once the engine is getting to full temperature the noise is no more.

Could this be an alternator?