Tacoma PreRunner L4-2.7L (3RZ-FE) (2004)
Thermostat: Service and Repair
REMOVAL
1. DRAIN ENGINE COOLANT
2. DISCONNECT LOWER RADIATOR HOSE
3. REMOVE THERMOSTAT
a. Remove the 2 nuts, water inlet and thermostat with gasket from the water pump.
b. Remove the gasket from the thermostat.
INSPECTION
INSPECT THERMOSTAT
HINT: The thermostat is numbered with the valve opening temperature.
a. Immerse the thermostat in water and gradually heat the water.
b. 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.