mitsubishi Workshop Repair Guides

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Water Pump > < Thermostat, Engine Cooling|Specifications|Page 2020
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1. Immerse the thermostat in water, and heat the water while stirring. Check the thermostat valve opening temperature.

Standard value: Valve opening temperature: 82 ± 1.5° C (180 ± 3°F) 

2. Check that the amount of valve lift is at the standard value when the water is at the full-opening temperature.

NOTE:  Measure the valve height when the thermostat is fully closed, and use this measurement to compare the valve height when the thermostat
is fully open.

Standard value:
Full-opening temperature: 95°C (203°F) 
Amount of valve lift: 9.0 mm (0.35 inch) 

Water Pump > < Thermostat, Engine Cooling|Specifications|Page 2020