The cavity behind the water pump vanes has three sources of water to the water pump:
(one passage returns water from the water cross-over to the pump even if the thermostat is closed. The large inlet passage brings cooled water from the radiator, and the third inlet passage to the water pump inlet cavity is the return from the heater core).
All three see negative pressures.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
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