Abstract: An apparatus for charging a cooling liquid to an engine cooling system. The apparatus comprises an additive reservoir for storing an additive such as an anti-icing agent, a cooling water reservoir for storing cooling water, a filler head adapted to be connected with a coolant inlet of an automobile engine cooling system, additive conduits extending between the additive reservoir and the fillter head, cooling water conduits extending between the cooling water reservoir. Additive control valves are provided in the additive conduits for controlling the quantity of the additive supplied to the engine cooling system in accordance with the capacity of the cooling system and a desired concentration of the additive.