Yamaha - Thermo Switch Assembly Cooling System Sensor 6D3-82560-01-00. Overview. On Yamaha outboards, keeping an eye on engine temperature isn't optional-it's critical. The thermo switch is one of those small parts that does a big job, kicking in when temps get out of range. I've seen engines saved just because this component did what it was supposed to do at the right time. When it's working right, you don't even think about it-but it's always watching in the background.. Key Features. • Temperature Monitoring Function - Activates based on engine temperature to help prevent overheating conditions.• Reliable Sensor Response - Designed to react quickly to temperature changes for consistent engine protection.• Durable Marine Construction - Built to handle heat cycles and harsh engine environments.• Precision Electrical Connection - Ensures stable communication with the engine's warning or control system.• Factory-Spec Fitment - Matches Yamaha specifications for proper installation and de