A Cooling System Relay is an electrical switch used to control the operation of the cooling fan or pump in a vehicle's cooling system. The relay acts as an intermediary between the vehicle's engine control unit (ECU) or temperature sensor and the cooling system components. It works by sending an electrical signal to the cooling fan or water pump when the engine temperature reaches a certain level. The relay can either activate or deactivate the cooling system, depending on the engine's temperature.

    The relay ensures that the cooling system operates only when necessary, preventing unnecessary energy consumption and wear on the components. When the engine temperature is high, the relay activates the cooling fan or pump, enabling the cooling system to lower the engine temperature. Conversely, when the engine cools down to a safe level, the relay will turn off the cooling system to prevent overcooling.