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Home >> Infiniti >> 1992 >> G20 Automatic >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 2.0L 4-CYL - VIN [C] >> Removal & Installation >> Cooling System Bleeding

Cooling System Bleeding

  1. Place heater temperature control cable in warmest heat position. Remove radiator cap. Remove air relief plug from thermostat housing and air bleeder cap from heater inlet hose. See Fig 1 and Fig 2 .
    Fig 1: Identifying Air Relief Plug
    G92J00421Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 2: Identifying Air Bleeder Cap
    G92A00422Courtesy of NISSAN MOTOR CO., U.S.A.
  2. Fill radiator with coolant. Install air relief plug once coolant flows from air relief plug opening. Tighten air relief plug to specification. See TORQUE SPECIFICATIONS  .
  3. Fill radiator and reservoir tank. Reinstall air bleeder cap. Install a temporary radiator cap with a steel wire installed between negative pressure valve and seat. See Fig 3 . This will allow air and coolant to be directed into coolant reservoir tank regardless of cooling system pressure.
    Fig 3: Installing Steel Wire in Radiator Cap
    G92B00423Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Warm engine to normal operating temperature. Operate it at 2500 RPM for 10 seconds, and then allow it to idle. Repeat procedure 3 times. Ensure engine does not overheat.
  5. Shut engine off, and allow it to cool. Remove temporary radiator cap, and check coolant level. Adjust radiator and coolant reservoir tank coolant level.
  6. Repeat steps 4) and 5) at least twice more. Install original radiator cap. Warm engine to normal operating temperature. Check for sound of coolant flowing through heater water valve with engine at 4000 RPM and heater temperature control cable in several different positions.
  7. If sound is heard, indicating air exists in cooling system, shut engine off. Allow engine to cool. Remove air bleeder cap on heater inlet hose. See Fig 2 .
  8. Attach transparent hose on air bleeder pipe on heater inlet hose with opposite end of hose in coolant reservoir tank. Install a temporary radiator cap with a steel wire installed between negative pressure valve and seat. See Fig 3 . Start engine and check for bubbles in coolant reservoir tank.
  9. Place heater temperature control cable in coldest position. This will bypass coolant through transparent hose. Operate engine at 2300 RPM until bubbles in transparent hose disappear.
    CAUTION: DO NOT exceed 2300 RPM or engine may be damaged due to reduced coolant flow.
  10. After bubbles disappear, place heater temperature control cable in warmest heat position. Check for sound of coolant flowing through heater water valve. If sound is heard, repeat step 9).
  11. If sound is not heard, stop engine, and allow it to cool. Install original radiator cap. Remove transparent hose. Install air bleeder cap.
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