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The 2008 GMC Sierra originally did not have a cabin air filter installed, but GMC started incorporating them into the Sierra models in 2010 and 2011. If you really want to filter your cabin in the 08 Sierra, there are aftermarket options available that can be added. You can find more details on how to do this at https://www.duRamaxforum.com/threads/how-to-add-cabin-air-filters.480890/. Keep in mind that this process is complex, and the potential risks may outweigh the advantages.
"Indeed. Located on the side for passengers.
Nope, the 2008 GMC Sierra doesn't come with a cabin air filter. It wasn't until after 2010 that GMC started offering the filters for specific models.