180 or 190 thermostat?

If I may, if the pump was capable of making pressures so high as to change vapor pressure, then are you telling me that the pump is making about 20 or so atmospheres of pressure? Not the fact that the cooling system is a closed system, but the water pump is doing that? That is also not the correct use of partial pressures, I mean no offense, but partial pressure is directly dependent on total pressure and the mole fraction of the system. So unless moles are changing, total pressure is. Also I thought you were talking about no thermostat, flowing too fast vs. pressure difference causing the problem? So are you referring to the engine as the restriction? In that case... PHYSICS MAJOR ACTIVATE lolol XD I have fun haha anyways, in that case, of course the water is going to be moving too fast, its going to the avoid the restriction and take the easiest path of travel, i.e. avoid as much of the engine block it can and flow the great thermostat missing opening. For anyone confused by my claims of chemist and all, I double majored in physics and chemist :P