2015 Kawasaki Vulcan 1700 Voyager ABS Owners Manual - Page 161

160 MAINTENANCE AND ADJUSTMENT the coolant passages, and considerably reduce the efficiency of the cooling system. NOTICE If hard water is used in the system, it causes scale accumulation in the water passages, and considerably reduces the efficiency of the cooling system. If the lowest ambient temperature encountered falls below the freezing point of water, use permanent antifreeze in the coolant to protect the cooling system against engine and radiator freeze -up, as well as from rust and corrosion. Use a permanent type of antifreeze (soft water and ethylene glycol plus corrosion and rust inhibitor chemicals for aluminum engines and radiators) in the cooling system. On the mixture ratio of coolant, choose the suitable one referring to the relation between freezing point and strength directed on the container. WARNING Coolant containing corrosion inhibitors for alminum engines and radiators include harmful chemicals for human body. Drinking coolant can result in serious injury or death. Use coolant in accordance with the instructions of the manufacturer. Soft or distilled water must be used with the antifreeze (see below for antifreeze) in the cooling system.