Intermittent Humming/droning from bonnet area whilst driving

[Richard DL]

Hi all
Any help would be appreciated. We have a 2017 MP 250 which has been great. However just recently we have noticed a very intermittent humming/droning noise when driving. It comes and goes and seems to be coming from under the bonnet. I’ve looked at the seal on the top side of the bonnet where the hinged size closes onto the engine compartment. Sorry not very technical so probably not described it very well. It doesn’t seem to be a major concern - nothing coming up on dash to say there is a problem so I am thinking it could be wind rushing through engine compartment and up out of the top side of the bonnett and seal not fitting right???! Thanks

 

[Tee]

Maybe check demister fan on max. Ours seems to be developing a droning noise as the fan volume increases and someone else here had similar.

 

[Richard DL]

Thanks. Yes we have the same but this is different. I will check again though.