Cadillac 2010 STS Owner's Manual page 380

How to Inspect the Engine Air
Cleaner/Filter
To inspect the air cleaner/filter remove the filter from the
vehicle and lightly shake the filter to release loose dust
and dirt. If the filter remains caked with dirt, a new filter
is required.
To inspect or replace the filter in the 3.6L V6 or
4.6L V8 engines, do the following:
1. Remove the two screws located on the top of the
cover.
2. Disconnect the coolant recovery hose so that it
is not going across the top of the engine air
cleaner/filter.
3. Loosen the clamp and remove the duct from the
passenger's side of the engine air cleaner/filter.
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4. The two sides of the airbox are hinged at the
bottom. Open the airbox by pushing the top of the
airbox cover toward the engine.
5. Remove the air filter by lifting it straight up through
the opening in the airbox.
6. Inspect or replace the engine air cleaner/filter. See
Maintenance Replacement Parts on page 7 11 for
the correct part number for the filter.
7. Reinstall the cover by reversing Steps 1 through 4.