E39 Cabin Filter Housing Procedure

The following information is provided for reference purposes only and should be used at your own risk
In no event shall Beisan Systems, LLC or its members be liable for incidental, consequential, or special loss or damages of any kind however caused.


Cabin filter housing removal

Left cabin filter housing removal


Remove housing cover by prying forward cover wire clip then pulling up on cover from front.
Disconnect housing strut tower mount spring clip. Press in on clip ends and wiggle clip off.


Disconnect duct from filter housing.
Pry 3 air duct bracket tabs off filter housing bracket (flathead). Rotate duct off filter housing.


Remove cabin filter housing and air duct from engine compartment.
Pull right side of filter housing up and away from front fender. Note positioning of filter housing upper left rear frame under and behind cowl frame.
Remove air duct by turning clockwise and pulling out.


Left hand drive cars: Fill sides of DME box (under cabin filter housing) with cloth towels. This prevents tools and parts from falling to side of box and be trapped under box.

Right cabin filter housing removal


Remove housing cover by prying forward cover wire clip then pulling up on cover from front.
Disconnect housing strut tower mount spring clip. Press in on clip ends and wiggle clip off.


Disconnect duct from filter housing.
Pry 3 air duct bracket tabs off filter housing bracket (flathead). Rotate duct off filter housing.


Remove cabin filter housing and air duct from engine compartment.
Pull left side of filter housing up and away from front fender. Note positioning of filter housing upper right rear frame under and behind cowl frame.
Remove air duct by turning counter clockwise and pulling out.

Cabin filter housing installation

Left cabin filter housing installation


Install cabin air duct.
Install duct by rotating clockwise from installation position, inserting into firewall access, pressing in and turning duct counter clockwise to hook onto studs.
Note: For proper insertion, align duct foam boot to mate flush with firewall opening (angled).
Note: If mounting is difficult, spray lubricant on firewall rubber boot (water based cleaner).


Mount cabin filter housing.
Tilt housing right side up and insert housing air duct into fender access hole. Position housing rear left top frame behind cowl frame for proper alignment. Lift up on cowl frame as needed.
Place windshield fluid hose, running along fender, under housing weather strip.
Fully insert housing duct into fender, align housing rear slots with cowl tabs, and lower housing right side. Insert housing lower mount bracket onto strut tower mounting stud.


Install filter housing strut tower mount spring clip. Press in and wiggle clip onto strut tower stud.
Turn air duct to mate with housing. Slide duct bracket bottom onto housing then snap duct bracket top three clips onto housing tabs.
Install housing cover and snap on retaining wire clip.

Right cabin filter housing installation


Install cabin air duct.
Install duct by rotating counter clockwise from installation position, inserting into firewall access, pressing in and turning duct clockwise to hook onto studs.
Note: For proper insertion, align duct foam boot to mate flush with firewall opening (angled).
Note: If mounting is difficult, spray lubricant on firewall rubber boot (water based cleaner).


Mount cabin filter housing.
Tilt housing left side up and insert housing air duct into fender access hole. Position housing rear right top frame behind cowl frame for proper alignment. Lift up on cowl frame as needed.
Fully insert housing duct into fender, align housing rear slots with cowl tabs, and lower housing left side. Insert housing lower mount bracket onto strut tower mounting stud.


Install filter housing strut tower mount spring clip. Press in and wiggle clip onto strut tower stud.
Turn air duct to mate with housing. Slide duct bracket bottom onto housing then snap duct bracket top three clips onto housing tabs.
Install housing cover and snap on retaining wire clip.


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