Thermostat, Engine Cooling

WARM-UP PHASE

Up to a coolant temperature of approximately 87° C (189° F), the main valve is closed and the bypass valve fully open.

PARTIAL-LOAD PHASE

The main valve begins to open at a coolant temperature of 86° C (189° F), and a small amount of coolant flows through the radiator.

FULL-LOAD PHASE

The main valve is fully open at a coolant temperature above 102° C (216° F).