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Cabin Microfilter Replacement
 
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Pelican Technical Article:

Cabin Microfilter Replacement

Nick Czerula

Time:

0.5 hours

Tab:

$30

Talent:

**

Tools:

Lint free rag, flathead screwdriver

Applicable Models:

BMW Z4 Convertible (2003-06)
BMW Z4 Coupe (2006)

Parts Required:

Cabin microfilter

Hot Tip:

Thoroughly clean microfilter housing

Performance Gain:

Good air flow through HVAC system

Complementary Modification:

Install charcoal activated filter and replace filter cover

BMW Z4 models utilize a HVAC fresh air cabin microfilter. The microfilter helps eliminate dirt and dust particles from entering the vehicle interior. It also protects HVAC system components from contamination. A dirty heater core would not provide sufficient heat and a dirty evaporator would not provide sufficient cooling. The cabin microfilter is located behind the glove box, mounted inside the heater housing.

BMW recommends replacing the fresh air cabin microfilter every 15,000 miles or every other oil change.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The cabin microfilter is located behind the glove box, mounted inside the heater housing.
Figure 1

The cabin microfilter is located behind the glove box, mounted inside the heater housing. You have to remove the footwell trim panel (green arrow) to access it. Start by removing the two Phillips head screws (red arrows).

Pull the footwell trim panel down (red arrow) and away from the dashboard.
Figure 2

Pull the footwell trim panel down (red arrow) and away from the dashboard. Allow it to rest on the floor. There is a light and the General Module attached to the panel. These items remain attached.

Locate the cabin microfilter cover (red arrow).
Figure 3

Locate the cabin microfilter cover (red arrow). Working at the side of the cover, unclip the tab (green arrow) and slide the cover toward the right side of the vehicle (inset).

Working at the side of the cover, unclip the tab and slide the cover toward the right side of the vehicle (red arrow).
Figure 4

Working at the side of the cover, unclip the tab and slide the cover toward the right side of the vehicle (red arrow). Remove the cover. If the cover seal is torn or worn, replace it with a new one.

Slide the filter down and out of the heater housing (red arrow).
Figure 5

Slide the filter down and out of the heater housing (red arrow).

Clean any debris (red arrow) out of the housing.
Figure 6

Clean any debris (red arrow) out of the housing. Wipe it clean with a lint free cloth.

Next, install the new cabin filter.
Figure 7

Next, install the new cabin filter. Be sure that the airflow arrow (red arrow) points toward the front of the vehicle.

When installing the lid, start by inserting the tabs (green arrow) into the slots (red arrow) in the housing.
Figure 8

When installing the lid, start by inserting the tabs (green arrow) into the slots (red arrow) in the housing. Press the cover up and hold it.

While holding the cover up, press it toward the left side of the vehicle, until the tab can be heard snapping into place (red arrow).
Figure 9

While holding the cover up, press it toward the left side of the vehicle, until the tab can be heard snapping into place (red arrow). Check that the cover is sealed and installed properly. Reinstall the footwell trim and check the HVAC operation.

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Page last updated: Sat 12/3/2016 02:56:18 AM