Cadillac 2006 STS - Manual (Page 200)

The access panel for the passenger compartment air
filter is located under the hood near the windshield,
on the passenger’s side of the vehicle. See Engine
Compartment Overview on page 5-12 for more
information on location. See Doing Your Own Service
Work on page 5-4 for information on doing your
own service work.
To access the passenger compartment air filter, do the
following:
1. Pull back the rubber hood seal from the edge of the
leaf screen vent cover.
2. Remove the three fasteners that hold the filter
access cover in place and slide the cover off.
3. To access the filter, remove the black plastic water
deflector by lifting the outboard edge of the deflector
to release the retention tab.
4. Lift the inboard edge of the deflector to release the
retention tab.
5. Lift and slide the water deflector toward the inboard
side and remove it.
6. The top edge of the filter should be visible. Reach
in and lift the filter out, pulling upward and toward
the front of the vehicle.
7. Insert the new air filter by sliding it back into place.
Make sure the arrow on the filter is pointing toward
the passenger compartment.
Reverse steps 1 through 3 to reinstall the water
deflector, filter cover and the hood seal.
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