Head gasket Tests? Help...
also take a dollar bill and put it flat up against the tail pipe while car is in park... it should steadily blow the dollar bill away from it, if the head gasket is blown every once in a while it will suck the dollar bill back towards the tail pipe..
If it detects combustion gas in coolant it will change the color of the dye.
Its pretty handy and it works
and all you have to do is take the radiator cap off to do it. 


