If you’re referring to the Range Rover sensor iron thermostat, it’s commonly called the thermostat housing with coolant temperature sensor.
The assembly includes:
* Thermostat – regulates engine coolant flow to maintain the correct operating temperature.
* Coolant temperature sensor – monitors coolant temperature and sends data to the engine control module (ECM).
* Thermostat housing (often aluminum or reinforced composite) – holds the thermostat and sensor in place.