Drain the coolant down to thermostat level or below.
Remove the coolant outlet fitting and gasket.
Remove the thrmostat.
Immerse the thermostat in hot coolant to check proper valve opening temperature. Replace if necessary.
Valve opening temperature : 82° C (177° F)
Full opening temperature : 95° C (205 °F)
Valve lift (at full open) : 8.5 mm (0.33 in.) or more
Heat the engine coolant temperature sender by submerging it in hot water.
Check that the resistance is within the specified range.
Resistance : 123.8 ~ 172.8 Ω at 60°C (140°F)
23.5 ~ 29.5 Ω at 115°C (239°F)