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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 638 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSWATER PUMP REPLACEMENT (L47)INSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Insert the seal into the recessed portion of the water crossover.
    Fig 1: Installing Water Pump
    G01817578Courtesy of GENERAL MOTORS CORP.

    Important:  The notched locking ear (1) must be in the 7 o'clock position.

    2. Fig 2: Identifying Water Pump Installation Position
    G01817579Courtesy of GENERAL MOTORS CORP.
  2. Index the water pumps locking ears with the tangs in the water crossover.
  3. Position the J 38816-A  to the water pump locking ears.
  4. Fasten the support plate to the water housing crossover, to ensure proper engagement of the tool to the water pump locking ears.
    CAUTION: Refer to FASTENER NOTICE .
  5. Turn the J 38816-A  counterclockwise.

    Tighten 

    Tighten the water pump to 100 N.m (74 ft lbs).

  6. Remove the support plate from the water housing crossover.
    Fig 3: Identifying J 38816-A
    G01817580Courtesy of GENERAL MOTORS CORP.
  7. Connect the water pump cover to the heater return hose.
  8. Install the water pump cover to the water housing crossover.
  9. Install the water pump cover bolts.

    Tighten 

    Tighten the water pump cover bolts to 10 N.m (89 in lbs).

  10. Connect the radiator outlet hose to the thermostat housing.
    Fig 4: Installing Water Pump Cover
    G01817581Courtesy of GENERAL MOTORS CORP.
  11. Install the water pump drive belt (4).
    Fig 5: Installing Water Pump Drive Belt
    G01817582Courtesy of GENERAL MOTORS CORP.
  12. Install the water pump belt cover.
  13. Install the oil level indicator tube nut.

    Tighten 

    Tighten the oil level indicator tube nut to 10 N.m (89 in lbs).

  14. Install the secondary AIR injection control valve. Refer to REMOVAL & INSTALLATION (4.0L -- BANK 2) .
  15. Install the air cleaner assembly. .
  16. Fill the cooling system. Refer to Draining and Filling Cooling System .
    Fig 6: Installing Water Pump Belt Cover
    G01817583Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.