3.
Disconnect the radiator upper hose (A).
Disassembly of the thermostat would have an adverse effect, causing a lowering of cooling efficiency.
Drain the engine coolant so its level is below thermostat.
(Refer to Cooling System - "Coolant")
Remove the vacuum pump.
(Refer to Cylinder Head Assembly - "Camshaft")
Disconnect the radiator upper hose (A).
Remove the thermostat cover (A) and thermostat (B).
Tightening torque :
24.5 ~ 34.3 N.m (2.0 ~ 2.5 kgf.m, 18.1 ~ 25.3 Ib-ft)
Remove the battery and battery tray.
(Refer to Engine Electrical System - "Battery")
Disconnect the EGR cooler.
(Refer to Intake and Exhaust System - "EGR Cooler")
Remove the thermostat housing (A) with the gasket.
Tightening torque :
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 Ib-ft)
When Installing the thermostat housing, replace with a new gasket.
Install in the reverse order of removal.
Fill with engine coolant.
(Refer to Cooling System - "Coolant").
Start engine and check for leaks.
Immerse the thermostat in water and gradually heat the water.
Check the valve opening temperature.
Valve opening temperature: 90±1.5°C(194±34.7°F)
Full opening temperature: 100°C (212°F)
If the valve opening temperature is not as specified, replace the thermostat.
Check the valve lift.
Valve lift : 8mm (0.3in) or more at 100°C (212°F)
If the valve lift is not as specified, replace the thermostat.
