Thermostats are critical components within a vehicle's cooling system, regulating engine temperature by controlling the flow of coolant. Located between the engine and the radiator - within the Engine Parts > Cooling System - these valves open and close to maintain optimal operating temperature, preventing overheating or inefficient combustion. A properly functioning thermostat ensures consistent performance and longevity of key engine components. These parts are essential for both passenger cars and commercial vehicles, and are often replaced during cooling system servicing. Examples within our range include MAN thermostat (MPN 51064020118), Febi thermostat (MPN FEBI15850), and MAHLE thermostat (MPN 70807789). Scania (MPN 2729053) and Febi (MPN FEBI172077) are also popular choices for professional mechanics.