have recently drained and flushed the coolant system for a small coolant leak somewhere. now have a big puddle of coolant after the car has gotten warmed up and turned off. no leak when running or after its cool. Thinking it may be the petcock. Leaking right above the metal V, where the petcock is located on the drivers side. cant find any info on how to change it. I know its not meant to come out. just want to know if its possible to do without screwing up the radiator. All hose checked out fine and my car temp is at normal operating level. anybody have any tips on changes petcock?