I'm used to water flowing other way into combustion chambers, but that is 17-18 psi... Old timers' signs for leaking head gasket: White residue or foam in oil Steam in exhaust (warm engine) Bill Robertson #5939 >--- In dmcnews@xxxxxxxxxxxxxxx, dherv10@xxxx wrote: > Group, A lot of people have asked me about air in the coolant and we all know > what that can do as far as turning on the fans. I now have a tool that will > let you know if the air is coming in from a leaky head gasket. It's on the > web site under cooling system. Bottom of the page. > John Hervey > http://www.specialtauto.com/cooling-system.shtml