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Originally Posted by vex
No. There is no check valve in a pinhole leak if it's present. If water gets out when at pressure, air will come in when there isn't. It's basic buoyancy and pressure differentials. The system will suck in air wherever possible as it's less dense and requires less energy to reach equilibrium pressure.
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You forget you're talking to another engineer here (and a VT AOE graduate to boot), but that is what I was getting at. If air entered through some small tear with the car off (under vacuum) it would be pushed out with the car on. The air would be pushed through the path of least resistance - the open radiator cap. However, because the car is on no additional air can enter so at some point the bubbling would stop. What I have is a constant stream (continues for more than 10 minutes) so this leads me to believe it is not the issue.
Quote:
Originally Posted by vex
No. What you might be able to do to confirm where your issue is; would be to break the coolant system into sections. Separate the radiator from the engine section and test each section. For instance you can block off one outlet on the water pump and pressurize the other. Check pressure after a few hours. Do the same for the radiator and you'll know which one's holding pressure and which one is not.
If your radiator isn't holding pressure because the brazing is falling apart that might be your issue, but if you haven't noticed leaks with it.... then well... That's what I'd do at least.
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I'd love to pressure test every component but I just don't have the means.
I'm inclined to believe ReTed that there is a small failure point likely on the compression side of the rotor housing. This would explain why I don't have a continuous cloud of white smoke because the pressure is keeping the coolant out, but would explain the little bit I get after starting the car after it's sat for a while. It's always done that but I just assumed it was condensation. I can think of nothing else that would cause the continuous build up of pressure. I guess the HPDE just pushed it over the edge. I was really hoping the stock engine would last more than 105k miles...