This FAE 36540 Radiator Fan Thermoswitch is designed to maintain your engine's optimal operating temperature. It accurately detects when the coolant reaches a specific temperature threshold and signals the radiator fan to engage, preventing overheating. Proper functioning of the thermoswitch is crucial for engine longevity and performance. A faulty switch can lead to the fan not turning on when needed, causing the engine to overheat, or staying on unnecessarily, which can impact fuel efficiency. FAE is a reputable brand known for producing reliable automotive components. This thermoswitch is built to meet or exceed original equipment specifications, offering a dependable solution for your vehicle's cooling system.