Cooling System (2UZ-FE): Inspection

INSPECT WATER PUMP ASSY
1. Visually check the air hole and water hole for coolant leakage.
  If leakage is found, replace the water pump and timing belt.
2. Turn the pulley, and check that the water pump bearing moves smoothly and quietly.
  If necessary, replace the water pump.
  
  Fig 1: Inspecting Water Pump Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FLUID COUPLING ASSY
1. Check that the fluid coupling is not damaged and that no silicon oil leaks.
  If necessary, replace the fluid coupling.
  
  Fig 2: Inspecting Fluid Coupling Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FAN BRACKET SUB-ASSY
1. Check the turning smoothness of the fan pulley.
  If necessary, replace the pulley bracket.
  
  Fig 3: Inspecting Fan Bracket Sub-Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT THERMOSTAT
HINT:

The thermostat is numbered with the valve opening temperature.

Fig 4: Identifying Thermostat Is Numbered With Valve Opening Temperature
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Immerse the thermostat in water and gradually heat the water.
  
  Fig 5: Immersing Thermostat In Water
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the valve opening temperature.
  Valve opening temperature: 80 - 84°C (176 - 183°F)
  
  If the valve opening temperature is not as specified, replace the thermostat.
3. Check the valve lift.
  Valve lift: 10 mm (0.39 in.) or more at 95°C (203°F)
  
  If the valve lift is not as specified, replace the thermostat.
  
  Fig 6: Checking Valve Lift
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check that the valve is fully closed when the thermostat is at low temperatures (below 40°C (104°F)).
  If not closed, replace the thermostat.
INSPECT RADIATOR CAP SUB-ASSY
NOTE:
- If the reservoir cap has contaminations, always rinse it with water.
- Before using a radiator cap tester, wet the relief valve and pressure valve with engine coolant or water.
1. Using a radiator cap tester, slowly pump the tester and check that air is coming from the vacuum valve.
  Pump speed: 1 push / (3 seconds or more)
  
  NOTE: Push the pump at a constant speed.
  
  HINT:
  - Pump speed: 1 push / (3 seconds or more)
  - If air is not coming from the vacuum valve, replace the reservoir cap.
  Fig 7: Checking Air From Vacuum Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Pump the tester and measure the relief valve opening pressure.
  - Standard opening pressure: 93 - 123 kPa (0.95 - 1.2 5 kgf/cm ² , 13.5 - 17.8 psi)
  - Minimum opening pressure: 78 kPa (0.8 kgf/cm ² ,11.4 psi)
  NOTE: This pump speed is for the first pump only (in order to close the vacuum valve). After this, the pump speed can be reduced.
  
  HINT:
  - Pump speed: 1 push within 1 second.
  - Use the tester's maximum reading as the opening pressure.
  - If the opening pressure is less than minimum, replace the reservoir cap.