How to change the cabin air filter in2005 loaded GMC sierra ?

SOURCE: Cabin filter for a GMC Yukon XL 05

They no longer used a cabin filter after about 2003. The cover is there buth it is molded shut with plastic welds.

SOURCE: GMC Sierra A/C Stops Cooling After Driving a Few Minutes

It sounds like you either have an condensor fan problem or low freon. The condensor fan is near the radiator. In some cases the radiator fan doubles as the condensor fan. So look there too.

SOURCE: where is the cabin filter on a sierra 2004 gmc sle

The 04 SIERRA is behind a panel with 4 screws under the glove box...Remove the screws and cover and slide it out.There is actually 2 in there and it is easy once the cover is off.

Usually there are extremely detailed instructions that come with the new filter when you open the box...Follow these instructions it shouldn't be too hard.

SOURCE: where is the air cabin filter in a 2004 gmc sierra

I can only advise you as to the replacement of a 2002 Sierra, under the dash behind the glove box compartment is a plastic panel held on with four screws, remove this panel and the cabin air filter should be easily identified and replaceable, if you purchase a filter from an Auto Zone Auto parts store or a similiar parts store, they will advise you of whether your vehicle is equipped with the filter/filters and also where its location will be.
Some vehicles are equipped with (two) cabin filters, and also I am told that if you purchase an OEM part(Original Equipment Part) instructions are to be included in the box to further assist you.

SOURCE: Where and how do you change the cabin air filter

I'm not sure but i think 03 and later yukons dont have them, I have an 05 yukon and pulled the cover off only to find solid plasic and nothing else to remove, certainly no clips to undue to remove anything. I looked and looked for about an hour. After some research on the net, it looks like there isn't one. strange they sell the part for my year. Either that or im looking in the wrong place.