Squealing Blower Motor, and renewal of Micro Filters

craig2859 · 02-16-2011, 05:25 PM

Decided to change the micro filters myself today.

Paid £25 for a set of them, and spent all of 5 mins, removing 6 screws and popping the new ones in. 2 mins to reset the CBS on the dash & done.

http://cgi.ebay.co.uk/BMW-E81-2-7-8-...item27b89409d7

I can not believe the quotes people have had for this to be done ... my daughter could do the job, it as easy as changing an air filter on an old Fiesta.

Anyway my Fan had started to make a squealing noise too, like the sound of a Hamster in a metal wheel ..... very annoying.

When I took the Micro filter cover off, you can clearly see two inlets where the air is drawn into the cab from the filters.

On the Passenger side one, looking in (they are quite large inlets so easy to see in), the Blower Motor is as clear as daylight to see.

Looking at it I could see the centre pin/spindle was rusty ....... something I have read about before, and after looking at what is really only a micro filter to protect it from moisture, its easy to see why it rusts !!!

Anyway, quick squirt of WD40, left for 5 mins, then ran the car up with the fan on full, and another small squirt, and no more squealing at all.

Quick fix, for what I think is a bad design.

DavS1 · 02-16-2011, 05:45 PM

I had mine out today, people really shouldn't be scared to pick up an 8mm socket and 1/4 drive ratchet!

Dr Dave · 02-17-2011, 01:06 PM

Dry fan motor bearings are a common problem - as you've found Craig, a simple squirt with WD40 and all's well

02-16-2011, 05:25 PM	#1
craig2859 Black .... all the way !! 58 Rep 601 Posts Drives: [Previous]2006 330d M-Sport Join Date: Aug 2009 Location: UK-Dorset iTrader: (4) Garage List 2006 E90 330d M-Sport [0.00]	Squealing Blower Motor, and renewal of Micro Filters Decided to change the micro filters myself today. Paid £25 for a set of them, and spent all of 5 mins, removing 6 screws and popping the new ones in. 2 mins to reset the CBS on the dash & done. http://cgi.ebay.co.uk/BMW-E81-2-7-8-...item27b89409d7 I can not believe the quotes people have had for this to be done ... my daughter could do the job, it as easy as changing an air filter on an old Fiesta. Anyway my Fan had started to make a squealing noise too, like the sound of a Hamster in a metal wheel ..... very annoying. When I took the Micro filter cover off, you can clearly see two inlets where the air is drawn into the cab from the filters. On the Passenger side one, looking in (they are quite large inlets so easy to see in), the Blower Motor is as clear as daylight to see. Looking at it I could see the centre pin/spindle was rusty ....... something I have read about before, and after looking at what is really only a micro filter to protect it from moisture, its easy to see why it rusts !!! Anyway, quick squirt of WD40, left for 5 mins, then ran the car up with the fan on full, and another small squirt, and no more squealing at all. Quick fix, for what I think is a bad design. Last edited by craig2859; 02-16-2011 at 05:40 PM..
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02-16-2011, 05:45 PM	#2
DavS1 Major 55 Rep 1,271 Posts Drives: Emfree Join Date: Aug 2010 Location: Glasgow iTrader: (0) Garage List 2011 BMW M3 [0.00]	I had mine out today, people really shouldn't be scared to pick up an 8mm socket and 1/4 drive ratchet! __________________ Monte Carlo Blue M3 Comp
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02-17-2011, 01:06 PM	#3
Dr Dave Zummerzet Zyder Drinker! 115 Rep 5,541 Posts Drives: '06 330D Le Mans Blue Join Date: May 2009 Location: Somerset iTrader: (3) Garage List 2006 330d M Sport [0.00]	Dry fan motor bearings are a common problem - as you've found Craig, a simple squirt with WD40 and all's well __________________
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