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Old 10-14-2010, 09:12 AM   #19 (permalink)
Piwoslaw
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Join Date: Oct 2008
Location: Warsaw, Poland
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Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
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Quote:
Originally Posted by tjts1 View Post
One thing you need to keep in mind is the water pump does more than just move coolant between the engine and the radiator. As the engine warms up and the thermostat is still closed, the water pump is circulating coolant between the block and head to keep an even temperature across the whole engine. Your electric water pump would have to run at all times even when the engine is cold.
I'll add that the thermostat has a tiny hole (or is never completely closed) to allow a small amount of coolant to circulate through it, instead of sitting in stagnant coolant. This is how it knows when to open.
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