GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2004 🢒 Grand Prix 🢒 Engine 🢒 Engine Mechanical - 3.8L 🢒 Water Pump Replacement

Removal Procedure

    Object Number: 46174 Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Reposition the accessory wiring junction block.
  3. Loosen the water pump pulley bolts.
  4. Remove the drive belt. Refer to Drive Belt Replacement in Engine Mechanical - 3.8L.
  5. Remove the water pump pulley bolts.
  6. Remove the water pump pulley.
  7. Remove the power steering pump mounting bolts and reposition. Refer to Power Steering Pump Replacement in Power Steering System.

    8. Object Number: 46177 Size: SH
  8. Remove the water pump bolts.

    9. Object Number: 46178 Size: SH
  9. Remove the water pump.
  10. Remove the water pump gasket.
  11. Clean and inspect the water pump gasket mating surfaces.

Installation Procedure

    Object Number: 46178 Size: SH
  1. Install the gasket and the water pump.

    2. 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.

  2. Install the water pump bolts.

    3. Tighten

        • Tighten the long water pump bolts to 34 N·m (25 lb ft).
        • Tighten the short water pump bolts to 22 N·m (16 lb ft).

    Object Number: 46174 Size: SH
  3. Install the water pump pulley.
  4. Install the water pump pulley bolts.

    5. Tighten
    Tighten the bolts to 13 N·m (115 lb in).

  5. Install the power steering pump. Refer to Power Steering Pump Replacement in Power Steering System.
  6. Install the drive belt. Refer to Drive Belt Replacement in Engine Mechanical - 3.8L.
  7. Install the accessory wiring junction block.
  8. Fill the cooling system. Refer to Cooling System Draining and Filling .