Thermostat, Engine Cooling

Use a tempilstick in order to find the opening and the closing temperatures of the thermostat.
^ J 24731 188 tempilstick melts at 87°C (188°F). The thermostat should begin to open at 90°C (194°F).
^ J 24731 206 tempilstick melts at 97°C (206°F). The thermostat should be fully open at 107°C (225°F).

Replace the thermostat if it does not operate properly between this temperature range.