Air Cleaner Inlet Duct Replacement for Cadillac STS 2009

1. Turn the ignition OFF.
2. Remove the front compartment sight shields as necessary. Refer to Front Compartment Sight Shields Replacement.
3. Remove the positive crankcase ventilation (PCV) hose from the air cleaner duct resonator.
4. Loosen the air cleaner duct clamps.
5. Remove the air cleaner duct.

1. Install the air cleaner intake duct.
2. Install the PCV hose to the intake duct resonator.

Caution: Refer to Fastener Caution in the Preface section.

3. Tighten the air cleaner duct clamps and tighten to 4 N·m (35 lb in).
4. Install the front compartment sight shields as necessary. Refer to Front Compartment Sight Shields Replacement.