Tacoma PreRunner V6-4.0L (1GR-FE) (2006)
Thermostat: Service and Repair
THERMOSTAT
REMOVAL
HINT: If the thermostat is not installed, cooling efficiency will be reduced. Do not remove the thermostat, to prevent the engine overheating.
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
2. DRAIN ENGINE COOLANT
3. REMOVE V-BANK COVER
4. REMOVE NO. 2 RADIATOR HOSE
5. REMOVE WATERY INLET WITH THERMOSTAT
a. Remove the 3 nuts, then remove the water inlet with thermostat and gasket.
INSPECTION
1. INSPECT WATER INLET WITH THERMOSTAT
HINT: The valve opening temperature is inscribed on the thermostat.
a. Immerse the thermostat in water, then gradually heat the water.
b. Check the valve opening temperature of the thermostat.
Valve opening temperature: 80 to 84°C (176 to 183°F)
If the valve opening temperature is not as specified, replace the thermostat.