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Originally Posted by KenE
Ken@Japan - But does't the Prius incorporate some sort of built in 'thermos', whereby the hot coolant is pumped into to preserve heat, then pumped back into the radiator/block when needed? If yes, does this feature work when driving between EV/ICE modes? Or does it only come into play when you stop? Or am I just full of "Hot Water"?
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http://john1701a.com/prius/presentat...ntation_38.htm
The hot water in thermos is only supplied to the cylinder head on starting up when the coolant temperature is less than 104F.
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The FEH/MMH cools down rapidly after entering EV mode from the air passing over the radiator fins.
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Prius is also easy to be cooled down on long downhill, but it does not happen on the flat road pulse and glide driving.
The thermostat shuts off the valve to the radiator when the coolant temperature is less than the spec, 190F FEH's case.
Therefore, the radiator does not work below 190F, then the engine is trying to avoid for further cooling down.
Attached graph is an example taken by my friend during his 55 minutes Prius commute.
He is a very good pulse and glide driver and achieves more than 85 MPG on commuting.
The unit of X axis is in 0.1 second, so it took 30 minutes to reach the stable approx 88C(190F).
I would like to say please try to watch carefully how coolant temperature is changing using ScanGauge or something.
Regards,
Ken@Japan
