The air filter is located inside a housing within the engine compartment. For models from 2006 and earlier, loosen the clamp securing the inlet tube to the air filter cover, release the clamps that hold the two halves of the air cleaner housing together, then separate the cover halves and remove the air filter element. For all models from 2007 onward, except for the 2018 and later 4.3L V6 engines, unclip the air cleaner housing from the radiator support, unsnap the two clips holding the air cleaner cap, and remove the cylindrical air filter element. For the 2018 and later 4.3L V6 engines, disconnect the air filter housing outlet duct and clamp, remove the mounting screws securing the two halves at the top of the cover, disconnect the electrical connector, and lift the cover to remove the element. Inspect the outer surface of the filter element; if dirty, replace it, but if only moderately dusty, it can be reused by blowing it clean from the back to the front with compressed air. As it is a pleated paper type filter, it cannot be washed or oiled, and if it cannot be cleaned satisfactorily, it should be discarded and replaced. While the cover is off, take care not to drop anything into the housing, and never drive the vehicle with the air cleaner removed, as this could lead to excessive engine wear and potential fire hazards. Wipe out the inside of the air cleaner housing, then place the new filter into the housing, ensuring it seats properly.