How to Change the Cabin Air Filter on a BMW Z4

1. Open the glove box door, and remove the trim on the heater side.
2. Remove the door straps and hinge mounting nuts. Then, remove the door.
3. Remove the four screws on the cover on the side of the heater. The filter is under the cover.
4. Slide the old filter out. Slide the new filter in.
5. Replace the cover and its four screws.
6. Reassemble the glove box door.