CABIN FILTER O4 SIERRA

  • Tiny
  • lapataume
  • 2004 GMC C1500
  • V8
  • 2WD
  • automatic
  • 97,000 miles

I have a 2004 sierra I need to change the cabin filter I know it has one I can see it people say it dont but it does how do I get at it to remove it the system seems to be sealed

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Saturday, January 1st, 2011 AT 2:23 AM

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  • Tiny
  • Wrenchtech
  • Expert
  • 20,052 posts

This Article has been updated by bulletin #PIT3330, dated December 22, 2004.

Condition/Concern:
A customer may inquire about the availability of the passenger compartment air filter.

Recommendation/Instructions:
Starting in 2003 model year, the passenger compartment air filter is no longer available as a factory option. With the redesigned HVAC case, there is no longer a cavity for the filter. The GM parts catalog indicates there is a replacement filter available; however, there is no provision for it.

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Saturday, January 1st, 2011 AT 2:44 AM
  • Tiny
  • lapataume
  • Member

As you can see in the picture there is one there but how to get at it is the question I see no clips no screws nothing to get at it do I have to remove the whole HVAC duct to get it out because it stinks and when I touch it its wet

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Saturday, January 1st, 2011 AT 3:31 AM
  • Tiny
  • Wrenchtech
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That's not a filter. That is your evaporator core and I would be very careful not to puncture or damage it or you'll have a bigger headache that you want to deal with.

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Saturday, January 1st, 2011 AT 12:55 PM
  • Tiny
  • lapataume
  • Member

Oh ok that makes sence then I dont understand why the vents blow stink air thoe and its wet inside there thats my whole issue it smells like stale water

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Saturday, January 1st, 2011 AT 6:27 PM
  • Tiny
  • Wrenchtech
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Evaporators are always wet from condensation. They grow bacteria after a while that causes the odor. Get one of those bug spray bottles with a spray wand and fill it with Lysol and spray it all over that evaporator and that should take care of the odor.

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Saturday, January 1st, 2011 AT 9:30 PM
  • Tiny
  • lapataume
  • Member

Thank you very much for the help I was going nuts trying to figure this thing out ill try the lysol and hope it works I dont even use my heat because of the smell that come out

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Saturday, January 1st, 2011 AT 9:54 PM
  • Tiny
  • Wrenchtech
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It will work as long as you have access to spray it directly on the evaporator. I've done it many times. Don't be afraid to saturate it. They sell a lot of products for this but the Lysol is the best bet.

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Saturday, January 1st, 2011 AT 10:00 PM

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