GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1996 🢒 Chevy G Van 🢒 Engine 🢒 Engine Cooling 🢒 Water Pump Replacement

Removal Procedure

    Notice: When adding coolant, use DEX-COOL® coolant. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner-at 50 000 km (30,000 mi) or 24 months.

  1. Partially drain the coolant. Refer to Cooling System Draining and Filling .
  2. Remove the air cleaner and the duct. Refer to Engine Controls.
  3. Remove the coolant recovery reservoir or the surge tank (Diesel).
    4. • For the coolant recovery reservoir, refer to Coolant Recovery Reservoir Replacement .
    • For the surge tank, refer to Surge Tank (Diesel) .

    Object Number: 71650 Size: SH
  4. Remove the upper fan shroud.
  5. Remove the fan and the clutch from the engine. Refer to Fan Clutch Replacement .
  6. Remove the accessory drive belt. Refer to Drive Belt Replacement in Engine Mechanical.

    7. Object Number: 48325 Size: SH
  7. For the 4.3L, remove the coolant pump pulley retaining bolts and the pulley.
  8. Disconnect the lower radiator hose from the coolant pump.

    9. Object Number: 71614 Size: SH
  9. Disconnect the by-pass hose from the coolant pump.
  10. Remove the coolant pump retaining bolts.
  11. Remove the coolant pump and the gasket.
  12. Clean the coolant pump mating surfaces.

    13. Object Number: 72721 Size: SH
  13. For the 5.0L and 5.7L, remove the coolant pump pulley retaining bolts and the pulley.
  14. Disconnect the lower radiator hose from the coolant pump.
  15. Disconnect the by-pass hose from the coolant pump.
  16. Remove the coolant pump retaining bolts.
  17. Remove the coolant pump and the gasket.
  18. Clean the coolant pump mating surfaces.

    19. Object Number: 66263 Size: SH
  19. For the 7.4L, remove the coolant pump pulley retaining bolts and the pulley.
  20. Disconnect the lower radiator hose from the coolant pump.
  21. Disconnect the by-pass hose from the coolant pump.
  22. Remove the coolant pump retaining bolts.
  23. Remove the coolant pump and the gasket.
  24. Clean the coolant pump mating surfaces.

    25. Object Number: 59826 Size: SH
  25. For the 6.5L diesel engine, remove the coolant pump pulley retaining bolts and the pulley.
  26. Disconnect the lower radiator hose from the coolant pump.
  27. Disconnect the by-pass hose from the coolant pump.
  28. Remove the vacuum pump from the engine. Refer to Vacuum Pump Replacement in Vacuum Pump.
  29. Remove the generator bracket from the engine. Refer to Charging System in Engine Electrical.
  30. Remove the coolant pump retaining bolts.
  31. Remove the coolant pump and the gasket.
  32. Remove the coolant pump plate from the engine.

    33. Object Number: 59828 Size: SH
  33. Remove the bolt from the back of the coolant pump backing plate.
  34. Clean the coolant pump mating surfaces.

Installation Procedure

    Object Number: 48325 Size: SH
  1. For the 4.3L, install the gasket and the coolant pump.
  2. Install the coolant pump retaining bolts.

    3. Tighten
    Tighten the coolant pump retaining bolts on the to 41 N·m (30 lb in).

    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.


    Object Number: 72721 Size: SH
  3. For the 5.0L and 5.7L, install the gasket and the coolant pump.
  4. Install the coolant pump retaining bolts.

    5. Tighten
    Tighten the coolant pump retaining bolts on the to 45 N·m (33 lb in).


    Object Number: 66263 Size: SH
  5. For the 7.4L, install the gasket and the coolant pump.
  6. Install the coolant pump retaining bolts.

    7. Tighten
    Tighten the coolant pump retaining bolts on the to 41 N·m (30 lb in).


    Object Number: 59828 Size: SH
  7. For the 6.5L diesel engine, install the coolant pump to the backing plate.

    8. Tighten
    Tighten the retaining bolt behind the coolant pump plate to 28 N·m (21 lb ft).


    Object Number: 59826 Size: SH
  8. Install the coolant pump and backing plate to the engine.

    9. Tighten
    Tighten the coolant pump plate retaining bolts to 23 N·m(17 lb ft).

  9. Connect the by-pass hose to the coolant pump.
  10. Connect the lower radiator hose to the coolant pump.
  11. Install the generator bracket to the engine. Refer to Charging Systems in Engine Electrical.
  12. Install the vacuum pump to the engine. Refer to Vacuum Pump Replacement in Vacuum Pump.
  13. Install the coolant pump pulley.
  14. Install the fan and the clutch to the engine. Refer to Fan Clutch Replacement .
  15. Install the accessory drive belt. Refer to Drive Belt Tensioner Replacement in Engine Mechanical.

    16. Object Number: 71650 Size: SH
  16. Install the upper fan shroud.
  17. Install the coolant recovery reservoir or the surge tank (Diesel).
    18. • For the reservoir, refer to Coolant Recovery Reservoir Replacement .
    • For the surge tank, refer to Surge Tank (Diesel) .
  18. Install the air cleaner and the duct.
  19. Refill the coolant. Refer to Cooling System Draining and Filling .
  20. Bleed the air from the cooling system.
  21. Inspect the system for coolant leaks.