GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Envoy - 4WD 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Water Pump Replacement

Water Pump Replacement LH6 and LS2

Tools Required

J 38185 Hose Clamp Pliers

Removal Procedure

    Object Number: 898123 Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Loosen the air cleaner outlet duct clamps at the following locations:
    3. • Throttle body
    • Mass air flow (MAF)/intake air temperature (IAT) sensor
  3. Remove the air cleaner outlet duct bolt and duct.
  4. Remove the accessory drive belt tensioner. Refer to Drive Belt Tensioner Replacement - Accessory for the 5.3L engine or Drive Belt Tensioner Replacement - Accessory for the 6.0L engine.
  5. Remove the cooing fan and shroud. Refer to Cooling Fan and Shroud Replacement .

    6. Object Number: 901490 Size: SH
  6. Using the J 38185 , reposition the inlet hose clamp at the water pump.
  7. Remove the inlet hose from the water pump.

    8. Object Number: 901491 Size: SH
  8. Using the J 38185 , reposition the outlet hose clamp at the water pump.
  9. Remove the outlet hose from the water pump.

    10. Object Number: 901492 Size: SH
  10. Remove the auxiliary heater inlet and outlet hose/pipe nut.
  11. Using the J 38185 , reposition the throttle body hose clamp at the throttle body.
  12. Remove the hose from the throttle body.
  13. Using the J 38185 , reposition the auxiliary heater inlet and outlet hose/pipe clamps at the water pump.
  14. Remove the inlet and outlet hoses/pipes from the water pump.

    15. Object Number: 260121 Size: SH
  15. Remove the water pump bolts.
  16. Remove the water pump and gaskets.
  17. Discard the water pump gaskets.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 260121 Size: SH

    Important: All gasket surfaces are to be free of oil or other foreign material during assembly.

  1. Install the water pump and NEW gaskets.
  2. Install the water pump bolts.

    3. Tighten

    1. On the initial pass, tighten the bolts to 15 N·m (11 lb ft).
    2. On the final pass, tighten the bolts to 30 N·m (22 lb ft).

    Object Number: 901492 Size: SH
  3. Install the auxiliary heater inlet and outlet hose/pipe nut.

    4. Tighten
    Tighten the nut to 10 N·m (89 lb in).

  4. Install the hose to the throttle body.
  5. Using J 38185 , position the throttle body hose clamp at the throttle body.
  6. Install the inlet and outlet hoses/pipes to the water pump.
  7. Using J 38185 , position the auxiliary heater inlet and outlet hose/pipe clamps at the water pump.

    8. Object Number: 901491 Size: SH
  8. Install the outlet hose to the water pump.
  9. Using J 38185 , position the outlet hose clamp at the water pump.

    10. Object Number: 901490 Size: SH
  10. Install the inlet hose to the water pump.
  11. Using J 38185 , position the inlet hose clamp at the water pump.
  12. Install the cooing fan and shroud. Refer to Cooling Fan and Shroud Replacement .
  13. Install the accessory drive belt tensioner. Refer to Drive Belt Tensioner Replacement - Accessory for the 5.3L engine or Drive Belt Tensioner Replacement - Accessory for the 6.0L engine.

    14. Object Number: 898123 Size: SH
  14. Install the air cleaner outlet duct and bolt.

    15. Tighten
    Tighten the bolt to 10 N·m (89 lb in).

  15. Tighten the air cleaner outlet duct clamps at the following locations:
    16. • Throttle body
    • MAF/IAT sensor

    Tighten
    Tighten the clamps to 7 N·m (62 lb in).

  16. Fill the cooling system. Refer to Cooling System Draining and Filling .