GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Turn OFF the ignition.
  2. Remove the retaining screws from the front portion of the left front wheel well/splash shield.
  3. Lower the splash shield far enough to gain access to the AIR pump assembly.

  4. Object Number: 256253  Size: SH
  5. Loosen and lower the AIR exhaust pipe (2) hose pinch clamp.
  6. Disconnect the AIR exhaust pipe (2) from the AIR pump (1).
  7. Disconnect the AIR pump electrical connector.

  8. Object Number: 256260  Size: SH
  9. Remove the 3 AIR pump (2) mounting bolts (1).
  10. Notice: Do not operate the AIR pump for more than 60 seconds. Continuous operation of the AIR pump in excess of 60 seconds will damage the AIR pump.

  11. Remove the AIR pump and bracket as an assembly.

Installation Procedure


    Object Number: 256260  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.

  1. Attach the AIR pump and bracket assembly (2) to the frame rail using the 3 attaching bolts (1).
  2. Tighten
    Tighten the attaching bolts to 10 N·m (89 lb in).

  3. Connect the AIR pump electrical connector.

  4. Object Number: 256253  Size: SH
  5. Attach the AIR exhaust pipe (2) to the AIR pump (1) outlet port.
  6. Place the AIR exhaust pipe pinch clamp around the AIR pump outlet port and exhaust hose connection.
  7. Raise the wheel well/splash shield into position.
  8. Re-install the wheel well/splash shield retaining screws.