[Trainer]

A 431/12 uses engine coolant, same as generator or main engine. Coolant should be 50/50 concentrate and distilled water. Some coolant is sold already diluted. If you only need a gallon or so, just use distilled water. It is recommended to no use undiluted coolant concentrate.

Radiator cap is a 13 lb one. But 10 or 7 lb will do. May need to take to auto parts store as young clerks can not find aqua hot in their computer so they are completely lost. But the old guys will know right away.