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How to Replace the Pollen Filter in a 993

Pelican Technical Article:

How to Replace the Pollen Filter in a 993


<1 hour






Flathead screwdriver.

Applicable Models:

Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Parts Required:

Pollen filters

Performance Gain:

Cleaner cabin air and restored vent airflow.

Complementary Modification:

Reverse wiper blades on your 993.

How to replace the pollen filter in a 993 
(7 pictures total to load)

The Porsche 993 have two pollen filter that filters all the incoming air to the central A/C and ventilation system.  The filters needs to be replace regularly just like the air filter for the engine, it all depends on how bad the air quality is where you live.  My original pollen filters was replaced at 10,000 miles and 17,000 miles later they sure are dirty! 

This is a comparison of the old and new. 

The filters are located in trunk in front of firewall. 

First remove the trim piece that covers that area to expose the pollen filter housing.  Pull up on the rubber strip will allow you to slide the plastic cover off.

unscrew the round metal nut that holds the pollen filter cover in place

Remove the pollen filter cover clip by wedging a flat screw driver underneath and pry it up.

This clip is a little tricky to get off, slide a flat screw driver down the clip and push and pull sway from the pollen filter housing simultaneously.

Slide the wiring harness that is on top of the pollen filter cover and disconnect the connector.  You will only need to do this for the right side pollen filter replacement.

Notice the position of the notch on the filter unit, the replacement unit needs to go back the same way.

Installation is the reverse of these steps.  Same procedure for the left side filter replacement.

Comments and Suggestions:
Will Comments: The electrical connector for a 993, as shown in your photo above, how do you separate it?
September 12, 2016
  Followup from the Pelican Staff: It should pull apart. - Nick at Pelican Parts  
Will Comments: How do you disconnect the electrical connector,on passenger side to install cabin filter. do you pry it apart?
August 25, 2016
  Followup from the Pelican Staff: What vehicle? Can you share a photo of the connector? - Nick at Pelican Parts  
356C&e36 Comments: Hello folks,

This is my first post. I ran into a little trouble last night while following the DIY for the pollen filter change. I didn't have me reading glasses on and I inadvertently separated the wiring harness on the passenger side at the wrong place. The wires on the lower side of the plug housing came out of the housing. I tried my best to document which color wire went where by prying off the cap on the other side of the plug housing and carefully examining the intact side of harness, but I'm only about 85% sure that I got it right. Everything seems to work except my cigarette lighter and I didn't smell anything when I turned on the ignition...

I am hoping that someone can post the wiring diagram for that plug or at a minimum, tell me what that bundle of wires is for.

Thanks so much.
October 27, 2012
  Followup from the Pelican Staff: Can you share a photo and the year and model of your Porsche? - Nick at Pelican Parts  
Muda Comments: The filter sits in a track a couple of mm away from the fan. Notches keep the tap in the right position. You can see it from the outside of the cover. There is a track on the screw side of the cover. Line that up first and bring the cover straight down. Found I had to use a razor knife and clean up the flashing a bit on the filter flange. Tight fit.
September 13, 2012
  Followup from the Pelican Staff: Thanks for the input on this one. We appreciate the help.
- Nick at Pelican Parts
bau Comments: Problem solved, an 1/8 inches diameter air-tube than ran along the side of the filter housing was accidentally dislodged. Re-connected it solved the problem.
August 9, 2012
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
bau Comments: Fans runs fine. But when air cond is switched on, the vent closes ... appear to be some type of electrical anomally. Will remove the filter all together to see if problem persists.
July 26, 2012
  Followup from the Pelican Staff: Are you referring to the fresh air vent? Could you supply a photo of what you see happening? - Nick at Pelican Parts  
Bau Comments: replace the filter fine but now the vent air flow became restricted whenever the air-conditioning is turned on. I am stumped.
July 22, 2012
  Followup from the Pelican Staff: Check if the filter is installed backward. This would restrict air flow. - Nick at Pelican Parts  
janne Comments: The filters has to go down perfectly straight down, or they will touch the fan unit. Check that the fans do not touch filters by running them before filter housing.
January 1, 2011
  Followup from the Pelican Staff: Thanks for the input on this one. We appreciate the help.
- Nick at Pelican Parts
itsfrank666 Comments: Wow. That looked quite easy, but turned out to need some skill. I took me while to figure out that when you slide the cover back in after replacing the filter, you have to do it straight down, perfectly vertical. But it finally worked ... love that car ... it's been 13 years now
November 4, 2009
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts

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