Are you saying that you ran the car with the pressure tester in place on the car and no radiator cap? If that's the case there was nothing there to relieve the pressure. A functional 15-lb cap will bleed off anything above 15. Dave S --- In dmcnews@xxxxxxxxxxxxxxx, BePositive2000@xxxx wrote: > > > Hi, All, > > I'm afraid I have a coolant pressure problem (too high) and am hoping > one of you will have a possible easily fixed cause, other than blown > head gasket. > > After having the coolant bottle cap blow (on my new SS bottle), I put > a pressure gage on the cooling system. With engine not running, I > pressurized the system to 15 psi. It held steady at 14.5 psi for over > 2 hours. Thought I was home free. > > I then started the car and watched the pressure rise slowly to 20 psi > before shutting off the car and doing possible damage. To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/