What is thermostat ?
The thermostat is a valve that goes between the engine and the radiator. Its purpose is to keep the engine working in a suitable temperature range. When the engine gets too hot, the thermostat opens up and lets the engine coolant flow through the radiator, where it cools off. When the engine is too cool, the thermostat closes and stops the coolant from flowing through the radiator, so the engine heats back up.
A thermostat controls the engine’s coolant temperature and stops the motor from overheating. When the engine is cold the thermostat is closed, preventing coolant from leaving the engine block. This helps the engine to warm up as quickly as possible, boosting its efficiency and lowering emissions and fuel consumption.