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Old 11-21-2011, 07:50 PM   #22 (permalink)
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Join Date: Feb 2009
Location: Estonia
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Green frog - '97 Audi A4 Avant 1.9TDI 81kW
90 day: 43.1 mpg (US)
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Passive system (no extra pumps) with one electric valve is minimum I think.
About heat-storage - probably best would be to put second heater core into insulated container and fill container with wax (keep some air room for expansion)

If you add electric pump then you can release that heat before starting a car. But first you can probably get away without it.
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