Yamaha - Thermostat Cover Cooling System Component 6CE-12413-A0-9S. Overview. The Yamaha Thermostat Cover 6CE-12413-A0-9S is designed to securely enclose and protect the thermostat within your engine's cooling system. This component helps maintain proper coolant flow and system pressure, ensuring your engine operates at the correct temperature. If the cover becomes cracked, warped, or improperly sealed, it can lead to coolant leaks or inconsistent temperature regulation. Replacing it helps restore proper cooling system performance and reliability.. Key Features. • Protective Thermostat Housing Cover - Secures and shields the thermostat for proper operation.. • OEM Fit Precision - Built to Yamaha specifications for accurate fit and dependable sealing.. • Maintains Cooling System Integrity - Helps regulate coolant flow and maintain system pressure.. • Durable Construction - Designed to withstand heat, pressure, and harsh marine environments.. Engine & Boat Compatibility. Verify compatibi