GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2009 🢒 STS 🢒 Engine 🢒 Engine Mechanical - 4.4L 🢒 Supercharger Inlet Duct Assembly Replacement

Removal Procedure

    Note: The following procedure is for removal and installation of both the front and rear section of the supercharger inlet duct assembly.

  1. The front section of the supercharger inlet duct assembly can be serviced independently of the rear section.

    2. Object Number: 1614080 Size: SH
  2. Remove the engine sight shield. Refer to Intake Manifold Sight Shield Replacement.
  3. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.

    4. Object Number: 1613993 Size: SH

    Note: There is a positive crankcase ventilation (PCV) hose fitting on the underside of the supercharger inlet duct.

  4. Disconnect the PCV hose fitting (1) from the underside of the inlet duct assembly. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement.

    5. Object Number: 1640656 Size: SH
  5. Loosen the rear screw clamps (2) located between the front and rear section of the inlet duct assembly.
  6. Remove the ball studs (1) that retain the inlet duct to the supercharger. There are a total of 6 ball studs.
  7. Remove the front section of the supercharger inlet duct.

    8. Object Number: 1644927 Size: SH
  8. Remove the hood assembly. Refer to Hood Replacement.
  9. Remove the windshield wiper arm assemblies. Refer to Windshield Wiper Arm Replacement.
  10. Remove the air inlet grille panel. Refer to Air Inlet Grille Panel Replacement.
  11. Remove the windshield wiper transmission. Refer to Windshield Wiper Transmission Replacement.
  12. Remove the front air inlet housing panel (1). Refer to Air Inlet Housing Front Panel Replacement.

    13. Object Number: 1644600 Size: SH
  13. Disconnect the evaporative emission (EVAP) line fitting (2) from the EVAP valve.
  14. Disconnect the EVAP line fitting (5) from the chassis bundle. Remove the EVAP line (6) from the vehicle.
  15. Remove the brake booster hose (1) from the port on the rear of the supercharger.
  16. Loosen the rear screw clamp (4) on the inlet duct seal.

    17. Object Number: 1652890 Size: SH
  17. Remove the rear section of the supercharger inlet duct from the vehicle.

Installation Procedure

    Object Number: 1652890 Size: SH
  1. Install the rear section of the supercharger inlet duct assembly to the vehicle.

    2. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1644600 Size: SH
  2. Tighten the rear screw clamp (4) on the inlet duct seal to 2.5 N·m (20 lb in).
  3. Install the brake booster hose (1) to the port on the rear of the supercharger.
  4. Connect the EVAP line fitting (5) to the chassis bundle.
  5. Connect the (EVAP) line fitting (2) to the EVAP valve.

    6. Object Number: 1644927 Size: SH
  6. Install the front air inlet housing panel (1). Refer to Air Inlet Housing Front Panel Replacement.
  7. Install the windshield wiper transmission. Refer to Windshield Wiper Transmission Replacement.
  8. Install the air inlet grille panel. Refer to Air Inlet Grille Panel Replacement.
  9. Install the windshield wiper arm assemblies. Refer to Windshield Wiper Arm Replacement.
  10. Install the hood assembly. Refer to Hood Replacement.

    11. Object Number: 1640656 Size: SH
  11. Install the front section of the supercharger inlet duct to the vehicle.
  12. Tighten the inlet duct screw clamps (2) to 2.5 N·m (20 lb in).
  13. Install the ball studs (1) that retain the inlet duct to the supercharger. There are a total of 6 ball studs. Tighten the supercharger inlet duct ball studs to 10 N·m (89 lb in).

    14. Object Number: 1613993 Size: SH
  14. Connect the PCV hose fitting (1) to the underside of the inlet duct assembly. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement.

    15. Object Number: 1614080 Size: SH
  15. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
  16. Install the engine sight shield. Refer to Intake Manifold Sight Shield Replacement.