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Coolant system can't hold any pressure
Hey, all --
I'm hoping you can help me figure this out:
New to me 2000 Boxster S. Previous owner reported an overheating issue, and the water pump was replaced by a Porsche-friendly indy shop. Still had temp issues -- the shop said bad head gasket and the owner then parked it for two years deciding what to do next.
Issue: I can't get it to stop ejecting coolant out of the tank's overflow.
It has a new (German) coolant expansion tank and it has a new '-04' cap on the tank, both from Pelican. I've flushed and refilled coolant and performed the usual air bleeding routine several times. If I run with the bleeder valve open, it will drizzle coolant constantly. If I rev the motor, upon deceleration it will eject a large volume of coolant. When I shut down the vehicle hot, it will dump even more coolant. If I close the bleeder valve, I will get steam coming from the overflow area when the car heats up (and it still dumps coolant).
I tried to pressure test the new tank, and I can't get it to pressurize at all. If I plug the overflow tube and just blow air into the coolant fill opening, air comes directly out of the overflow hole (what leads to the overflow tube - between the bleeder valve and the fill cap). This happens immediately -- it doesn't build any pressure first. No matter what I try, the coolant system won't hold any pressure.
Thoughts?
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