Mercury - Thermostat Kit Cooling System V6 135-200HP Outboards 75692T2. Overview. When an outboard runs too hot or too cold, you feel it - sluggish throttle, uneven idle, maybe even a warning beep you don't want to hear. The Mercury Marine 75692T2 Thermostat Kit helps bring your engine's temperature back where it should be. It's made for Mercury and Mariner V6 135-200HP outboards (except DFI and OptiMax models) and includes two thermostats and two rubber gaskets - one for each bank. Built to Mer