Quote:
Originally Posted by dcb
thermostat is basically a large pumping loss most of the time. The mechanical pump has to work against the thermostat most of the time. An electric pump only has to pump hard enough to keep the temperature correct
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Nope. When the thermostat is closed, a bypass is open to allow full coolant flow back to the water pump inlet. It takes absolutely no more power to pump through the bypass when the engine is cold than it does to pump through the rad when it is hot. The thermostat is two valves: rad closed/open and bypass open/closed.