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Cabin Filter Replacement
 
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Pelican Technical Article:

Cabin Filter Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$0

Talent:

*

Tools:

Your hands

Applicable Models:

Porsche 944 Turbo (1986-89)

Hot Tip:

Make your own filter

Performance Gain:

Clean cabin air

Complementary Modification:

Change engine air filter

Have you every switched on the fan in your Porsche 944 and got hit in the face by dirt coming out of the vents? This can be caused by, believe it or not, the fact that the 944 does not have cabin air filters. The blower motor housing has two screens on each end to stop the big pieces from getting into the fans but does not filter the air.

This article will show you how to remove the screens and make some suggestions for home-made filters.

The blower motor housing and filters are located under the cowl cover piece at the base of the windshield (red arrow).
Figure 1

The blower motor housing and "filters" are located under the cowl cover piece at the base of the windshield (red arrow).

Begin by pulling up and removing the rubber seal that runs along the divider between the engine bay and HVAC system (red arrow).
Figure 2

Begin by pulling up and removing the rubber seal that runs along the divider between the engine bay and HVAC system (red arrow).

You will need to remove the plastic cover (red arrow).
Figure 3

You will need to remove the plastic cover (red arrow). There is a very good chance this will not come off in one piece; these get very old and brittle over the years. If you have not removed it lately, there is a good chance you will damage it and need to replace it when removing.

With the cover off you will see the blower motor housing (red arrow) that has a metal filter on each end (yellow arrows).
Figure 4

With the cover off you will see the blower motor housing (red arrow) that has a metal "filter" on each end (yellow arrows).

The filters, which are just metal screens, clip on to the ends of the housing (red arrow, one shown).
Figure 5

The filters, which are just metal screens, clip on to the ends of the housing (red arrow, one shown).

Unclip the screen and maneuver it out (red arrow).
Figure 6

Unclip the screen and maneuver it out (red arrow).

A lot of people like to make their own filters for the air box screen (red arrow).
Figure 7

A lot of people like to make their own filters for the air box screen (red arrow). Some people just place a dryer sheet between the screen and housing, while other people cut furnace filters down to size. If you are going to install your own filter, I recommend spraying the outside of the screen with some matt tack or glue and adhering the filter of choice to the outside. This way it cannot get sucked into the fans. If you ever want to return the screen to original condition, you can just scrap the homemade filters, sand and paint the metal screens.


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