The 2008 GMC Sierra does not come fitted with a cabin air filter. GMC began adding to them to the Sierra in the 2010 and 2011 model years. However, if You're dead set on filtering Your cabin, there are aftermarket solutions that exist that can be fitted onto the 08 Sierra. For more information, check out https://www.duRamaxforum.com/threads/how-to-add-cabin-air-filters.480890/ . Just be aware that this is a complicated procedure, and the risks tend to outweigh the benefits.
Real answer
September 10, 2020
Yes. On passenger side
Emma W.
August 29, 2019
No, the 2008 GMC Sierra does not have a cabin air filter. It wasn't until after 2010 that GMC began making the filters available on certain models.
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