How To: Replace Cabin Air Filter - Chevy and GMC Duramax Diesel Forum
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Old 03-21-2011, 09:10 PM   eBay Motors  #1 (permalink)
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How To: Replace Cabin Air Filter

Before I start, this is an optional feature for 2001 and 2002 Silverados only. If your vehicle is not one of those, then what follows is likely not very useful for you.

This procedure is fairly simple, but it has been asked on the forums a few times and I hope to document the procedure clearly here. The filters I used were the Wix 24805. They come in a two-pack for about 15 dollars at the local parts store or on Amazon.

This is probably good annual maintenance. Tools required are 7mm deep well socket (or a standard socket with a really short extension), 5mm socket, and of course a socket wrench.

It has been suggested to turn the vent position to blow towards the feet before starting this procedure.

1) Remove the shroud from under the passenger's side of the dash.

This requires the removal of 3 screws 7mm head. I recommend removing the screw over the transmission hump first and working towards the outside of the truck. It is the screw over the transmission hump that requires a deep well or extension. It is well recessed.

The third of these screws is visible in the photo of the shroud.

shroud.jpg

2) Remove the air filter cover.

This is the long thin cover shown in the below photo. It is held on with just one 5mm screw.

cover.jpg

3) Remove the first air filter.

With the cover removed, the first air filter should be quite obvious. Pull it straight down.

both.jpg

4) Remove the second air filter.

This second air filter is harder to see. It is towards the fore end of the vehicle. Reach back and slide it aft until it resides where the first filter was and then pull straight down. If the filter has not been changed recently, expect debris to fall now.

one.jpg

4b) Turn on the vehicle with the fan on high.

This step is optional. It will blow much of the now free debris out. Hopefully the vents were set to the floor before you did this to minimize vacuuming.

neither.jpg

5) Install the first filter.

Push the filter straight up the hole and slide it back into position.

one.jpg

6) Install the second filter.

Push the second filter straight up into the hole.

both.jpg

7) Reinstall the cover.

Hook the cover in the front and rock it up into place. Secure with the one 5mm bolt.

cover.jpg

8) Reinstall the shroud.

Push the shroud back into place. Begin from the outside and work in this time. Put in only the first two screws.

shroud.jpg

9) Discard the third screw.

It may seem worthwhile to install all of the factory screws into all of the factory holes. It is not.
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Old 03-21-2011, 09:16 PM   eBay Motors  #2 (permalink)
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insight and caveats

If you purchased your vehicle used from an owner that did not perform regular maintenance, you probably had air filters that look much darker than the new ones and a lot of debris. Having a vacuum on-hand is a good idea.

compare.jpg

There is no part of the filthy filter that should not reassure you that replacing cabin air filters is worthwhile. Similarly, all of that dirt is dirt that was not pushed into the air, so having the air filters in place instead of just deleting them is similarly worthwhile. If you need any additional convincing, just look to the smiling madwoman on the filter packaging. If you do not replace your filter, you will have to deal with her.

Lastly, the filters are fore and aft in parallel, not in series. Under no circumstances should you ever try to pry at the thing beside the first filter. It will make a very expensive and time-consuming whooshing sound.

nono.jpg

I repeat, if you are blindly reaching around for the second air filter with your pocket knife and accidentally poke this item, it will result in freon escaping your AC system and considerable cursing.
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Last edited by kjelderg; 03-21-2011 at 09:18 PM. Reason: adjectives are useful.
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Old 03-21-2011, 09:33 PM   eBay Motors  #3 (permalink)
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This was only on the 01/02 models? The newer trucks don't have them?
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Old 03-21-2011, 09:40 PM   eBay Motors  #4 (permalink)
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Quote:
Originally Posted by Enigma66 View Post
This was only on the 01/02 models? The newer trucks don't have them?
I believe this is true. If it is not, I would gladly change the intro.
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Old 03-22-2011, 06:02 PM   eBay Motors  #5 (permalink)
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Quote:
Originally Posted by kjelderg View Post
I believe this is true. If it is not, I would gladly change the intro.
Bummer, would be nice to have a filter my truck.
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Old 06-18-2011, 04:22 PM   eBay Motors  #6 (permalink)
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Perfect write up - I am sure mine is an 03, but it has a lot of the 02 parts since it was early early 03. going to have to dive under the dash and find out for sure. Someone that knows how to clean the evaporator under there should do a write up also! it appears to have very little access to be able to clean it.
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Old 06-21-2011, 01:12 PM   eBay Motors  #7 (permalink)
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Cleaning the Evaporator can reportedly be done with a spray if you remove the blower motor.
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Old 07-17-2011, 06:09 PM   eBay Motors  #8 (permalink)
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thank you so much for the intro on this! never new where mine are. and im sure mine are DIRTY! they have never been changed from what i know of lol ill let u guys know! thanks again!
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Old 07-17-2011, 11:44 PM   eBay Motors  #9 (permalink)
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That is correct, only 99-02 GMT-900s had the in cabin filter. GM then eliminated the filter, and your under hood light, and your foot well lights and passenger side door handle key port as a way of saving money.
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Old 07-18-2011, 03:21 AM   eBay Motors  #10 (permalink)
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Mine is a late month 03 and it has all of these options on it.
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