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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1003 (Engine Cooling System) >> Repair Instructions >> Water Pump Replacement (4.3L Engine) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. If reusing the old fasteners, apply sealant GM P/N 12346004, (Canadian P/N 10953480), or equivalent to the threads of the water pump bolts.
  2. Install NEW water pump gaskets and the water pump.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  3. Install the water pump bolts.

    Tighten:  Tighten the bolts to 45 N.m (33 lb ft).

    4. Fig 1: View Of Water Pump & Bolts
    GM188054Courtesy of GENERAL MOTORS CORP.
  4. Using J 41240  , hold the water pump pulley, install the water pump pulley bolts.

    Tighten:  Tighten the bolts to 25 N.m (18 lb ft).

    5. Fig 2: Installing Fan, Water Pump Pulley & Bolts
    GM317191Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: After assembly, the hose clamp tangs (water pump end) must point forward and the upper tang should be level with the outside diameter of the water pump inlet hose.
  5. Install the water pump inlet hose.
  6. Position the water pump inlet hose clamps.
    7. Fig 3: View Of Water Pump Inlet Hose & Clamps
    GM182853Courtesy of GENERAL MOTORS CORP.
  7. Install the radiator outlet hose to the water pump.
  8. Install the radiator outlet hose to the surge tank.
  9. Position the radiator outlet hose clamps at the surge tank and water pump.
    10. Fig 4: View Of Radiator Outlet Hose & Water Pump (4.3L)
    GM367001Courtesy of GENERAL MOTORS CORP.
  10. Install the drive belt. Refer to Drive Belt Replacement in Engine Mechanical -4.3L.
  11. Install the cooling fan. Refer to Fan Clutch Replacement .
  12. Align the hinge clip with the lip on the throttle body.

    In order to install the air cleaner outlet duct, pivot the air cleaner outlet duct downward until the mounting stud is through the hole.

    13. Fig 5: View Of Air Cleaner Outlet Duct
    GM489176Courtesy of GENERAL MOTORS CORP.
  13. Install the air cleaner adapter nut.
    14. Fig 6: View Of Air Cleaner Adapter Nut
    GM489179Courtesy of GENERAL MOTORS CORP.
  14. Install the PCV hose.
    15. Fig 7: Positive Crankcase Ventilation (PCV) Hose
    GM701705Courtesy of GENERAL MOTORS CORP.
  15. Tighten the air cleaner outlet duct clamp at the MAF/IAT sensor.

    Tighten:  Tighten the clamps to 4 N.m (35 lb in).

    16. Fig 8: View Of Air Cleaner Outlet Duct Clamp
    GM360851Courtesy of GENERAL MOTORS CORP.
  16. Fill the cooling system. Refer to Draining and Filling Cooling System (without HP2) .
  17. Inspect the cooling system for leaks.
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