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Dan
Dan, Auto Technician
Category: Chevy
Satisfied Customers: 3490
Experience:  GM Mark of Excellence/ Service Guild Participant with 13 years experience, ASE Master Certified
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How do you change a water pump on a 2002 chevy trailblazer

Customer Question

how do you change a water pump on a 2002 chevy trailblazer
Submitted: 8 years ago.
Category: Chevy
Expert:  Dan replied 8 years ago.
Water Pump Replacement (LL8)

Tool Required

J 41240 Fan Clutch Remover and Installer

Removal Procedure

  1. Drain the coolant. Refer to Cooling System Draining and Filling .
  2. Remove the fan and shroud. Refer to Cooling Fan and Shroud Replacement .
  3. Remove the drive belt. Refer to Drive Belt Replacement .
    Object Number: 748318  Size: SH
    Click here for detailed picture of above image.
  4. Using the J 41240 , secure the water pump pulley and remove the water pump pulley bolts.
  5. Remove the J 41240 .
  6. Remove the water pump pulley.
    Object Number: 637645  Size: SH
    Click here for detailed picture of above image.
  7. Loosen and remove the water pump bolts.
  8. Remove the water pump.
  9. Clean and inspect the water pump. Refer to Water Pump Cleaning and Inspection .
  10. Discard and replace the gasket.

Installation Procedure

  1. Install a new water pump gasket.

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 637645  Size: SH
    Click here for detailed picture of above image.
  2. Install the water pump and secure the water pump with the bolts.

    Tighten

    On the initial pass, tighten the bolts to 4 N·m (35 lb in).
    On the final pass, tighten the bolts to 10 N·m (89 lb in).

    Object Number: 748318  Size: SH
    Click here for detailed picture of above image.

  3. Install the water pump pulley.
  4. Install the water pump pulley bolts.
  5. Using the J 41240 , secure the water pump pulley while tightening the water pump pulley bolts.

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

  6. Remove the J 41240 .
  7. Install the drive belt. Refer to Drive Belt Replacement .
  8. Install the fan and the shroud. Refer to Cooling Fan and Shroud Replacement .
  9. Fill the cooling system with the specified coolant and concentration. Refer to Cooling System Draining and Filling .
  10. Inspect for leaks.