Section 48 (Engine Cooling System): Engine: Thermostat: Operation
WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The engine cooling thermostat is a wax pellet driven, reverse poppet choke type. The thermostat is designed to provide the fastest warm up possible operating temperature of 88°C (190°F). The thermostat also will automatically reach wide open so it will not restrict flow to the radiator as temperature of the coolant rises in hot weather. Above this temperature the coolant temperature is controlled by the radiator, fan, and ambient temperature, not the thermostat.