GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. For a 2WD vehicle, ignore steps 5 and 6.
  3. For a 4WD vehicle, ignore steps 3 and 4.


    Object Number: 372939  Size: SH
  4. Remove the (AIR) shield mounting bolts.

  5. Object Number: 372933  Size: SH
  6. Remove the AIR shield.

  7. Object Number: 325346  Size: SH
  8. Remove the retaining bolts from the steering linkage shield.

  9. Object Number: 325348  Size: SH
  10. Remove the steering linkage shield.

  11. Object Number: 416592  Size: SH
  12. Disconnect the vacuum hose (1) from the shut-off valve (2).

  13. Object Number: 416593  Size: SH
  14. Disconnect the shut-off valve hose (1) from the AIR pump by releasing the spring clamp.

  15. Object Number: 416594  Size: SH
  16. Disconnect the reactor pipe assembly from the reactor pipes by releasing the spring clamps.

  17. Object Number: 373100  Size: SH
  18. Remove the reactor pipe assembly.

Installation Procedure


    Object Number: 416594  Size: SH
  1. Connect the reactor pipe assembly to the reactor pipes by installing the spring clamps.

  2. Object Number: 416592  Size: SH
  3. Install the vacuum hose (1) to the shut-off valve (2).

  4. Object Number: 416593  Size: SH
  5. Connect the shut-off valve hose (1) to the AIR pump by installing the spring clamp.
  6. For a 2WD vehicle, ignore steps 7 and 8.
  7. For a 4WD vehicle, ignore steps 5 and 6.


    Object Number: 372933  Size: SH
  8. Align the AIR shield.

  9. Object Number: 372939  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  10. Install the AIR shield mounting bolts.
  11. Tighten
    Tighten the bolts to 33 N·m (24 lb ft).


    Object Number: 325348  Size: SH
  12. Align the steering linkage shield.

  13. Object Number: 325346  Size: SH
  14. Install the linkage shield mounting bolts.
  15. Tighten
    Tighten the bolts to 33 N·m (24 lb ft).

  16. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.