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Seek to understand,^Value
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Discussion Starter · #1 ·
Yeah, it's incredibly simple, but, believe it or not, I actually had to peruse the "mit einbauanleitung" (=== includes mounting instructions") that came with my CUK2736-2 adsotop Mann "innenraumfilter mit aktivkohle" (=== cabin filter with activated charcoal) purchased from Autohauz (P/N: 64.11.0.008.138) for $11.87 each ($23.74 for the set) with free shipping (because I added a dozen Mann $5.47 oil filters to bump the price over $50).

The new filter didn't look like the old filter (and it didn't have a one-way plastic tab), so I had to read the instructions that came with it.

Even then, I needlessly removed the cabin-filter housing spring clip and the three air-duct clips on the first of two exchanges.

So, I decided to write my own BMW E39 cabin-air filter DIY (if not for anyone else, at least for my own future reference).

NOTE: Also useful to remove air conditioning stink (see this thread).

Here goes ... (as always, please improve if needed).

 

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Seek to understand,^Value
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Discussion Starter · #2 ·
Since summer is coming up, you should also check your two undercarriage drain hoses when you clean out the cabin air filter drains and replace the cabin air filters.

Otherwise, you may get the dreaded gym-sock air conditioning stink!

 

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Seek to understand,^Value
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Discussion Starter · #3 ·

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Technical Graphite > ALL
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Bluebee, you rock. :clap: Everyone needs to do these simple things to keep their Bimmer smelling fresh.
 

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Seek to understand,^Value
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Discussion Starter · #5 · (Edited)
Today, gunksny kindly posted a cabin air filter DIY PDF (e39 Cabin Filter DIY.pdf):
- E39 Cabin Filter Replacement DIY

I added his link above just now to the bestlinks for future reference:
- How to DIY replace the activated charcoal cabin air filter (1) (2) & what cabin filter to buy (1) (2) & cn90's inexpensive cabin filter retrofit (1) (2) (3) & cabin air filter implications for stinky air conditioning (1) (2)

For convenience, here are the pictures reproduced from that thread, only shrunken to 640x480 pixels:



 

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Seek to understand,^Value
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Discussion Starter · #6 · (Edited)
It feels good to know, that, at least today, this (simple) DIY helped someone:
- E39 (1997 - 2003) > Mann Cabin Filter Air Flow

Ok searched again after posting, found a bluebee post with this link, appears confirmation of arrow pointing up (as in towards the underside of the hood)
Of course, as simple as this DIY is, it isn't without controversy:

The air flows from top to bottom, and then into the car. Arrow points down. Ignore the writing.
The arrows on the microfilters should point upward...and Bluebee's as well as the other illustration confirms this.

Look again (closely) at the illustration...the air enters the microfilter compartment and flows UPWARD thru the filter, then the "fresh" air flows FROM the top of the microfilter into the car's HVAC system. The arrows near the microfilter are curved upwards to indicate that fresh air is drawn into the BOTTOM of the microfilter's plenum first...then UPWARD thru the micro & carbon filtering media, then into the car's HVAC fresh air intake. This allows HEAVY objects sucked into the plenum (or water) to fall to the bottom of the plenum otherwise it would have to fight gravity to enter into the system as the air is being drawn into the system. This is also why the water drains are at the bottom of the filter housing. If the directional flow was from TOP to BOTTOM then the filters would get soaking wet every time it rained or you washed the car: ;)

 

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Seek to understand,^Value
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Discussion Starter · #7 ·

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Seek to understand,^Value
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Discussion Starter · #10 · (Edited)
I just accidentally realized a neat trick for helping get the cabin air filter housing back into the bimmer.

You can rotate left the snorkel on the side of the cabin air filter housing (and remove it if you need it out of the way).


Then, you put the cabin air filter housing back.

And, lastly, you rotate the snorkel back in place.
 

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Constantly Learning
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Nicely timed wakeup Blue. I recently had to check brake fluid and may need new filters soon.

I checked the links and didn't see any mention of aFe filters. Anyone out there using? Cost more but claim lifetime, so you save in the end. I'm asking about the ProDry, not the oiled ones.
 

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Hi fellas

I'm new to this forum so forgive me if this has been discussed before.

The passenger side center front a/c vent is spitting out bits of old grey foam.

What the hell is it and how can i fix it? I have that vent shut off for now but thats not ideal....

Thanks
 

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Since summer is coming up, you should also check your two undercarriage drain hoses when you clean out the cabin air filter drains and replace the cabin air filters.

Otherwise, you may get the dreaded gym-sock air conditioning stink!

I'm in Georgia and its going to get warm in about a month so thanks for these posts. Do you have a better picture for the drain hoses? And what should I be looking for with these hoses?
 

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Nicely timed wakeup Blue. I recently had to check brake fluid and may need new filters soon.

I checked the links and didn't see any mention of aFe filters. Anyone out there using? Cost more but claim lifetime, so you save in the end. I'm asking about the ProDry, not the oiled ones.
For the engine air filter, they're great. I alternate between a ProDry and oiled between oil changes, but I haven't heard anything about aFe making cabin filters.

My butt dyno told me I lost some low end torque, but when you open 'er up it works extremely well. Also, stick with the dry filter, as the oiled one dirtied up my MAF quite a bit.
 

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Seek to understand,^Value
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Discussion Starter · #17 ·
For the record, this was asked today:
I purchased Fram air cabin filters for my 528. They have arrows on the side (edges) and the advisory "direction of air flow". It is not obvious to me which way the air flows. Can anyone advise whether the air flows up or down?
See also:
- How to DIY replace the activated charcoal cabin air filter (1) (2) & what cabin filter to buy (1) (2) & cn90's inexpensive cabin filter retrofit (1) (2) (3) & cabin air filter implications for stinky air conditioning (1) (2)
 

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Seek to understand,^Value
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Discussion Starter · #18 · (Edited)
Here's an exhaustive list of replacement cabin air filters from today:
Below is a list with the equivalent charcoal activated cabin filters, exact fit for BMW e39. Just pick the cheapest, I think:

Air Qualitee AQ1055C
ATP CF-105 RA-60
Beck Arnley 042-2076
BMW OEM 64 11 0 008 138
Bosch C3821
Champ CAF1722
Fram CF10369
G.K. Industries CF1067
Hengst E960LC-2
Mahle LAK 73/S
Mann CUK 2736-2
Micron-Air BM97130C
Purolator C35509
TYC 800048C2
Wix 49372

Personally, I used TYC for the last 5 years without an issue. Very good quality and very cheap.
EDIT: See also:
- How to replace the activated charcoal cabin air filter (1) (2) (3) & what cabin filter to buy (1) (2) & cn90's inexpensive cabin filter retrofit (1) (2) (3)
 

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Seek to understand,^Value
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25,199 Posts
Discussion Starter · #20 ·
This question came up today ...
> E39 (1997 - 2003) > Air and Cabin filters.

Can anyone tell me which brand air and cabin filters to get? Also, is the carbon activated filter a good way to go or are the paper filters best. Fram has all of the ones I need but not sure about the quality.

Thanks.
Get the one th as t looks li I e it will get the job done that it was designed to do...and fits your budget.

As far as activated charcoal or plain...again this is your call to make. Do you know what the actvated charcoal filters purpose is? It's to help filter odors from the fresh air entering the HVAC system. If that matters to you...then again it's your choice to make versus plain filter.
 
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