Abstract: A device connectable in the cooling system of an automobile engine includes a heating chamber through which the engine coolant flows, and which includes a tubular heating coil. The coil is connected between the windshield washer fluid reservoir and the windshield washer nozzle or nozzles of the vehicle. Windshield washer liquid flowing through the coil is warmed by heat exchange with hot engine coolant flowing through the chamber in which the coil is mounted. In a modified arrangement, the device incorporates a second function, in that the chamber is enlarged to include, in addition to the windshield washer fluid heating coil, an electrical heating element which can be connected to house current while the vehicle is parked with its engine not running. The engine coolant is thus heated to keep the engine warm during cold weather by thermal circulation.