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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 688 (Engine Cooling System) >> Repair Instructions >> Draining & Filling Cooling System >> Engine Block Draining

Engine Block Draining

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drain the cooling system, refer to the above procedure.
  2. If equipped with the 4.3L engine, remove the left and right engine block coolant drain plugs.
    3. Fig 1: Left & Right Engine Block Coolant Drain Plugs - 4.3L
    G01657908Courtesy of GENERAL MOTORS CORP.
  3. If equipped with the 4.8L, 5.3L or 6.0L engine, remove the left and right engine block coolant drain plugs.
    Fig 2: Left & Right Engine Block Coolant Drain Plugs - 4.8L, 5.3L Or 6.0L
    G01657909Courtesy of GENERAL MOTORS CORP.
  4. If equipped with the 6.6L diesel engine, remove the left and right engine block coolant drain plugs and washers.
    Fig 3: Left & Right Engine Block Coolant Drain Plugs & Washers - 6.6L
    G01657910Courtesy of GENERAL MOTORS CORP.
  5. If equipped with the 8.1L engine, remove the left and right engine block coolant drain plugs.
  6. Remove the engine block coolant heater, if equipped. Refer to Coolant Heater Replacement (4.3L Engine) , Coolant Heater Replacement (4.8L, 5.3L & 6.0L Engines) , Coolant Heater Replacement (6.6L Engine)  or Coolant Heater Replacement (8.1L Engine)  .
  7. Allow the engine block to drain completely.
  8. Apply sealant to all drain plugs, EXCEPT the 6.6L diesel engine plugs.
  9. Re-install the engine block coolant drain plugs.
    Fig 4: Engine Block Coolant Drain Plug
    G01657911Courtesy of GENERAL MOTORS CORP.
    • Tighten the 4.3L engine block coolant drain plug to 20 N.m (15 lb ft).
    • Tighten the 4.8L, 5.3L or 6.0L engine block coolant drain plug to 60 N.m (44 lb ft).
    • Tighten the 6.6L diesel engine block coolant drain plug to 18 N.m (13 lb ft).
    • Tighten the 8.1L engine block coolant drain plug to 60 N.m (44 lb ft).
  10. Install the engine block coolant heater, if equipped.

    Refer to Coolant Heater Replacement (4.3L Engine) , Coolant Heater Replacement (4.8L, 5.3L & 6.0L Engines) , Coolant Heater Replacement (6.6L Engine)  or Coolant Heater Replacement (8.1L Engine)  .

  11. Fill the cooling system, refer to the above procedure.
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