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The 2006 GMC Sierra 3500 SLE with the LBZ 6.6 Duramax does not have a cabin filter.
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Remove the glove box door. The cabin filter is in a holder on the left side of the heater core.
they do not have a cabin air filter
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3500
A 1990 GMC Sierra can be purchased used on websites such as eBay Motors, Edmunds, or Craigslist. Availability may be determined by the buyers location.
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The cabin air filter on a 2005 GMC Sierra is changed by removing the cover under the glove compartment and opening the filter housing. The old filter is then removed and a new filter put in its place.
The cabin air filters are located in the heater box above the lower panel, mounted below the glove box.drop the plastic panel, 3-7mm screws, then you will see a black access panel, with 1 screw holding it up. the 2 filters are located there. Sorry, I misread the question and read it as 2000 GMC Sierra. Your 2008 GMC Sierra doe not have a cabin filter.