Yamaha - Exchanger, heat - 6H4-12466-A0-00 Mercury-50HP-EFI-2015 A: Usually it’s a wiring

A: Usually it’s a wiring or calibration issue

No sudden temperature spikes or worrying warning tones — just a steady stream and a motor that stays happy

and handle the harsh marine environment far better

Oil 10w30qt (Sold Individually)WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer

Supersedes to 69G-W0078-02-00

Yamaha - Exchanger, heat - 6H4-12466-A0-00 Mercury-50HP-EFI-2015 A: Usually it’s a wiringYamaha Heat Exchanger Engine Cooling System 6H4 12466 A0 00 Overview When cooling systems start acting up, its not always the obvious stuff like the impellersometimes its deeper in the system. Ive worked on motors where temps crept up slowly, and it traced back to restricted or failing heat exchangers. This part plays a big role in keeping engine temps stable under load. When its working right, the motor runs clean and consistent, even on long runs.