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      02-05-2018, 09:29 AM   #1
F30zoom
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Question Fan noise from behind dash?

Guys I have a fan noise that goes with the Rev range sounding behind my dash in the middle any ideas? I can stop it by turning off my a/c which currently isnít running due to outside temps of 2C so itís not a/c related

Help pls

Thanks
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      02-05-2018, 10:27 AM   #2
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Does the sound doing a change if increaseing the speed of the fan?
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      02-05-2018, 10:29 AM   #3
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Quote:
Originally Posted by Dang3r View Post
Does the sound doing a change if increaseing the speed of the fan?


No mate totally independent from the heater fan. Fan noise goes up and down with the revs
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      02-05-2018, 10:42 AM   #4
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No, what I meant: If you have the A/C off and just the fan on and play little with the speed...then anything to hear from the frequency of the noise?
I ask because sometimes the fan soaks some foreign objects against the grilles under the bonnet and sometimes those objects made it through until their get ripped to shreds...but until this finally happens, they're making disturbing noises.
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      02-05-2018, 10:44 AM   #5
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Quote:
Originally Posted by Dang3r View Post
No, what I meant: If you have the A/C off and just the fan on and play little with the speed...then anything to hear from the frequency of the noise?
I ask because sometimes the fan soaks some foreign objects against the grilles under the bonnet and sometimes those objects made it through until their get ripped to shreds...but until this finally happens, they're making disturbing noises.
Thanks for that but I have already removed all the rubbish from there. The noise is not linked to the heater fan unit.
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      02-06-2018, 01:44 PM   #6
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How old is your car? Maybe the blowby heater itself with a beginning electric motor failure?
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      01-02-2020, 05:10 PM   #7
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Hi @F30Zoom did you manage to get to the bottom this problem? I have exactly the same issue in my 2012 F31 330d. Thanks.
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      01-03-2020, 02:02 AM   #8
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Hi @F30Zoom did you manage to get to the bottom this problem? I have exactly the same issue in my 2012 F31 330d. Thanks.
I had the A/C serviced and re-gassed as it was empty this reduced the noise by about 75% but not completely, it was linked to the A/C because if you turned mine off it stopped. Previous owner had been running it empty for sometime.

Hope that helps not a complete fix but good enough.

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      01-03-2020, 05:50 AM   #9
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Thanks, will give that a go.
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      01-25-2020, 12:35 AM   #10
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Quote:
Originally Posted by F30zoom View Post
Guys I have a fan noise that goes with the Rev range sounding behind my dash in the middle any ideas? I can stop it by turning off my a/c which currently isnít running due to outside temps of 2C so itís not a/c related

Help pls

Thanks
Hello,
I have the same noise . It is the cooler from the nav unit . That cooler is almost dead for me and is making noise when is hot in the interior .
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