This FAE thermostat, part number 5321889, is designed to regulate the engine's operating temperature by controlling the flow of coolant. Proper functioning of the thermostat is crucial for maintaining the engine within its ideal temperature range, preventing overheating and ensuring efficient performance. A faulty thermostat can lead to either the engine running too cold or too hot, both of which can cause damage and reduce fuel economy. FAE is a reputable brand known for producing reliable cooling system components. This thermostat is built to meet or exceed original equipment specifications, providing a dependable solution for your vehicle's cooling needs.