Cadillac 2012 CTS Owner's Manual page 329

8. Remove the air cleaner filter
from the air cleaner housing.
1. Install the air cleaner into the air
cleaner housing. The outer air
cleaner filter seal must be fitted
properly in the air cleaner
housing.
2. Align the air cleaner housing
cover tabs to the air cleaner
housing.
3. Install the air cleaner housing
cover.
4. Install the air cleaner housing
cover screws.
5. Install the hose to the air cleaner
housing mounting arm. The hose
must be routed correctly.
6. Install the air cleaner outlet duct
to the air cleaner housing.
7. Tighten the air cleaner outlet
duct screw clamp.
8. Attach the electrical connector to
the air box.
9. Reinstall the side cover.
Operating the engine with the air
cleaner/filter off can cause you or
others to be burned. The air
cleaner not only cleans the air; it
helps to stop flames if the engine
backfires. Use caution when
working on the engine and do not
drive with the air cleaner/filter off.