topless -
you're definitely correct that the pumps are designed to apply pressure into the engine; this is normal. it's still possible (and usual) to do this, but to put the thermostat on the other side of the engine at the large outlet. this way, pressure is into the engine, but the thermostat is placed in hot flow rather than cool flow. bottom line: the thermostat is usually (i thought ALWAYS) at the coolant EXIT of the engine, not the entrance.
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Originally Posted by Topless
Ok I gave this some thought and I think I understand why the motor is on the pressure side of the pump. It creates a higher pressure zone when picking up heat in the water passages which raises the boiling point. A few psi makes a pretty big difference (Boyle's law). Now the T-stat simply acts like an automated valve. When it opens coolant is sent to the radiators and when closed coolant returns to the water pump for recirculation through the motor.
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