GMC 2001 Yukon XL Owner's Manual page 322

Your engine air cleaner/filter is located in the
passenger's side front corner of the engine compartment.
See "Engine Compartment Overview" in the Index for
more information on location.
1. To remove the air filter, loosen the screws on the cover.
Then lift the cover upward and remove the filter from
the engine air cleaner/filter housing. Care should be
taken to dislodge as little dirt as possible.
2. Clean the filter sealing surface and the filter housing.
3. Install the new filter.
4. Install the cover and tighten the screws on the air
cleaner cover.
Refer to the Maintenance Schedule to determine when to
replace the air filter. See "Owner Checks and Services"
in the Index.
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