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Message: <blockquote data-quote="Lee12609" data-source="post: 716559" data-attributes="member: 12415">duffy is right its called a "block kit". you put the (blue) dye in a reservoir, then its snugged into the radiator where the cap attaches, and a ball is put ontop of that, crank the car, and let it idle for 1 minute if the dye changes the green/yellow you have a combustion leak into the coolant system (blown head gasket, cracked head etc).....i use my block kit daily and its about 90% accurate, but a few have slipped through that tested good but werent. i think its about $50 for the kit, but i purchased mine years ago so i could be wrong.</blockquote>