●For use on gasoline only not recommended for disel
●Remove radiator cap and check coolant level. siphon or drain coolant unit level is 2 or 3 inches below opening. (a higher level will permit coolant to be drawn into leak check, contaminating the test fluid)
●Fill leak check with fluid to white line by removing top black rubber cap from clear plastic tube
●With engine warm and idling, push rubber cone into radiator opening and hold
●Squeeze and release aspirator (black) bulb for 2 minutes (unless test fluid turns yellow sooner)