It doesn't have a cabin filter.
Purchase a Purolator cabin filter for your truck, it comes with complete instructions.
How to Replace a Cabin Air Filter on a 2006 GMC
These trucks do not have a cabin air filter.
Passenger side under the dash. Remove the screw and the plastic cover drops down and then you can slide the cabin air filter out.
they do not have a cabin air filter
No the cabin filter was not put in these trucks.
The 2006 GMC Sierra 3500 SLE with the LBZ 6.6 Duramax does not have a cabin filter.
There is no cabin air filter on the 2006 year model of the GMC Yukons and Denalis.
No it does not.
2006 GMC Envoy Denali is not factory equipped with a cabin air filter. You can do a modification to add one but it takes some cutting. If you're so inclined, you can find directions on the internet.
How to change cabin air filter on 2000 c7500 dumptruck