RE520488: Engine Coolant Heater (120V)In cold climates the coolant heater makes it easier to start the engine. Reduces Engine Wear: By preheating the internal engine components before starting, engine wear is reduced while also creating heat for the heating, ventilation, and air conditioning (HVAC) system. Additional Information: If the tractor is not equipped with a factory installed heater, the following parts are required and must be purchased through Service Parts: 19M7862 screw,