[Carjack]

Had a noisy CH fan particularly when on full blast over this recent hot weather. Sounded like a Merlin engine warming up at the end of the runway!
Quite liked it!
Anyway the car had to go in for an oil change (subject of another post) so the BMW Main Dealer said they would sort it.
To my surprise they said it was a leaf jammed in the fan!
And the remedy: a mod, a grill in front of the fan to trap leaves!
How can this be possible when there is supposed to be an air intake microfilter!
I am baffled! I suspect the filter had not been positioned correctly and therefore let past a leaf.
Anyone any other ideas?

[Mr NSB]

This is quite common, I have had this mod as well. I think the filter is after the fan as in the air is pumped through the pollen filter.

[MarkG_M5Comp]

I have this on our F20 - going in for first service and 'mod' agh the end of the month.

[Nexstar2011]

Had this on mine too. Car was only a few months old and the dealer tried to get me to sign a disclaimer that I'd guarantee coughing up a few hundred quid if they found nothing. After telling them where they could poke that, they found a leaf in the fan and applied the mod

[Theone88]

Originally Posted by Mr NSB

This is quite common, I have had this mod as well. I think the filter is after the fan as in the air is pumped through the pollen filter.

+1

Me too!

[HighlandPete]

Originally Posted by Carjack

How can this be possible when there is supposed to be an air intake microfilter!
I am baffled! I suspect the filter had not been positioned correctly and therefore let past a leaf.
Anyone any other ideas?

In the F30 The microfilter is installed on the pressure side of the blower. This reduces air contaminants in both fresh-air and air recirculation modes.

Looks as if BMW have a problem ahead of the blower.

HighlandPete

[Thackers]

Bizarre I was going to start a thread on this last week..

Has anyone experienced the excessive noise purely when the AC is firing up or on full.....the excessive noise for me reduces if the fans are running but with Air con off?..

[claykin]

I checked realoem and couldn't find a production change for the leaf screen. Anyone?

[cyberbob]

Only brought my used 2012 320d Luxury just over a week ago, to my surprise turn the blowers up high and wow what a noise...:-O
Took it back started to explain it to the service guy he knew straight away what the problem was. Had the filter fitted now all good..

[flc1962]

Yep +1