Ben McCafferty wrote:
> The problem is, I'm also trying to be environmentally friendly about
> this, and can't see just pumping four gallons of coolant into the bay.

I tried and failed to find a place to recycle antifreeze in Chicago.
The idea here seems to be that if it goes into a sanitary sewer system
and thru a water treatment process its OK.  On the other hand if it goes
into  a "storm sewer" it may drain straight into the bay, lake, river,
etc...not OK.  So it depends on the drainage arrangement in your area
and where it goes as it comes out of your van.

-but I'm not sure if the water would heat quickly enough
> (before it gets to the thermostat) to make it up to the radiator.
>

Use hot water if possible and add it slowly, so the engine won't be
heating too much at one time.  You should be able to tell if it is
circulating properly by feeling for heat at the input hose to the
radiator.  Watch your temp gauge.

have fun,
Larry A.