> David, the water pump in the car is not a positive displacement pump. The
> moment the impeller is exposed to air it will stop sucking. You are
assuming
> that the pump will suck all the liquid gradually from the radiator until
> dry.
> This can happen if the radiator was on top of the engine, or the pump was
> the self priming type, which is not the case.
> Regards;
> Bulent

True.  I personally am not concerned about when the pump stops pumping in a
leak situation - I hope to have indication of leak and be on ground before
that unhappy event ever happens!

David