Radiator in tank

["3liter" <saltfever@comcast.net>]

Keith: what is not clear in the archives (or I missed it) is how you get the
coolant (in the tank) to circulate through the radiator. Do you simply rely
on conduction/convection...doesn't seem too efficient.  I remember something
about a water pump and a screen to shield ice from hitting the pump.
However, could you re-describe the set-up?  Are you forcing cooling water
through the radiator core?  -Elon