Yamaha - Thermostat Cover Cooling System Component 6CE-12413-C0-9S. Overview. The Yamaha Thermostat Cover 6CE-12413-C0-9S is designed to enclose and protect the thermostat within your engine's cooling system, ensuring proper coolant flow and temperature regulation. This component helps maintain system pressure and sealing, which is essential for consistent engine performance. If the cover becomes damaged, cracked, or improperly sealed, it can lead to coolant leaks or unstable engine temperatures. Replacing it helps restore reliable cooling system operation.. 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