Cooling System 37 Recommended coolant consists of a 50/50 mixture of antifreeze and clean water. Never run the engine with water only. Regardless of the season, the coolant should always contain at least 40 to 60 percent ethylene glycol (antifreeze). The antifreeze also contains anti-corrosion agents that the cooling system needs to stay functional. Note: DO NOT use a winterfront for the cooling system. See the Operator’s Manual, Engine Start and Operation, for more information. W2003082 Note: DO NOT mix regular antifreeze into coolant mixed with extended life antifreeze. The extended life properties can not be maintained, with much reduced service interval as a result.
Engine design requires the thermostat in the engine during summer and winter. Correct engine temperature should be a minimum of 165 C) with a properly functioning thermostat. F (75 WARNING Coolant may be combustible. Coolant leaked or spilled onto hot surfaces or electrical components can cause a fire. Clean up coolant spills immediately. DO NOT add cold coolant to an overheated engine because a cracked cylinder head and/or block may result.