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Old 07-13-2018, 04:03 PM
Join Date: Aug 2016
Location: Katy, TX
Posts: 27
dayasingh is on a distinguished road
Noisy AC Blower Fan

About one year ago, I took out the AC blower fan and lubricated the bearings with the ubiquitous 3in1 oil. However, the blower is starting to make that noise again. Any suggestions for a lube that will last longer.
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Old 07-14-2018, 02:00 AM
Join Date: Mar 2017
Location: Iowa
Posts: 33
Badsmerf is on a distinguished road
Use an electric motor grease. Unless you're able to gain access to the bearing itself (i wasn't when I applied grease), it likely isn't a permanent fix. Grease around the outside should be pulled in by capillary action (a small amount). I'll let you know when mine starts making noise again lol... I just did this a few months ago.
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Old 07-16-2018, 05:16 PM
Join Date: Dec 2014
Location: New England
Posts: 449
josiahg52 is on a distinguished road
3-IN-ONE is not a good choice for electric motors. Well, they do make a 20W oil that comes in a blue bottle that is decent. Grease of any kind is also a poor choice.

What you want is an oil that is detergent free. A common and readily available choice is "turbine" oil. La-Co and other companies bottle it in a "zoom spout" bottle. Most air tool oil works well also.

You can probably salvage your blower motor but now the pores in the bearing are probably clogged up with oil solids. Any oil you add will quiet the motor for a bit but now you'll probably realize shorter and shorter service intervals until finally it will lock up.

I replaced my blower motor because it got noisy. I don't remember if the bearings were accessible but the best course of action is to disassemble the motor and scrub the bearings clean. A phosphor-bronze bore brush works great.

After their clean, you want to heat the bearings while soaking them in oil then letting them cool down to ambient. The bearings come from the factory impregnated with oil. You will be removing and flushing some of that oil away during the cleaning. The oil you have used in the past has also displaced some of the good oil.

The hard part after all of this will be the reassembly ensuring that the bearings are parallel to each other and perpendicular to the shaft. Usually there is enough shaft exposed that a few firm taps with a soft-face hammer on it will set them up. Again, I don't remember the accessibility of these components so it might be impossible to accomplish this overhaul.
8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim
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Old 07-17-2018, 12:28 PM
Join Date: Aug 2005
Location: X5world
Posts: 249
smassey321 is on a distinguished road
In my experience you can oil the once. The 2nd time they make noise again after a few months.
2009 X5d w/ AD, CIC/Combox
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noisy ac blower lubricant

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