COOLING SYSTEM INSPECTION


  1. INSPECT WATER PUMP ASSEMBLY


    1. A01BF2DE02

      Check that there are no engine coolant leaks from the drain hole.

    2. Check that the pulley can be turned smoothly and that there is no abnormal noise from the bearing.

  2. INSPECT THERMOSTAT


    1. A01BC39E01

      The valve opening temperature is provided on the thermostat.

    2. A01BAJWE04

      Immerse the thermostat in water and gradually heat the water.

    3. A01BEOVE03

      Check the valve opening temperature.

      Valve opening temperature
      80 to 84°C (176 to 183°F)

      Tech Tips

      If the valve opening temperature is not as specified, replace the thermostat.

    4. Check the valve lift.

      Valve lift
      8.0 mm (0.315 in.) or more at 95°C (203°F)

    5. Check that the valve is fully closed when the thermostat is at low temperatures (below 40°C (104°F)).

      Tech Tips

      If the valve lift is not as specified, replace the thermostat.

  3. INSPECT RADIATOR CAP SUB-ASSEMBLY

    Note


    • If the radiator cap is contaminated, always rinse it with water.

    • Before using a radiator cap tester, wet the relief valve and pressure valve with engine coolant or water.

    • When performing steps (a) and (b) below, keep the tester at an angle of over 30° above the horizontal.


    1. A01BF2OE01

      Using a radiator cap tester, slowly pump the tester and check that air is coming from the vacuum valve.

      Pump speed
      1 push every 3 seconds or more

      Note

      Push the pump at a constant speed.

      Tech Tips

      If air is not coming from the vacuum valve, replace the radiator cap.

    2. Pump the tester and measure the relief valve opening pressure.

      Pump speed
      1 push within 1 second

      Note

      The pump speed above should be followed for the first pump only. After the vacuum valve is closed, the pump speed can be reduced.

      Standard opening pressure
      93.3 to 122.7 kPa (0.95 to 1.25 kgf*cm2, 13.5 to 17.8 psi)
      Minimum opening pressure
      78.5 kPa (0.78 kgf*cm2, 11.1 psi)

      Tech Tips

      Pay attention to the tester's maximum reading of the opening pressure. If the maximum reading is less than the minimum opening pressure above, replace the radiator cap.