At 02:38 PM 8/22/2010, neil n wrote:
>http://tinyurl.com/28ct5ew  But.... my guess is that the bubble wrap

Ouch.  I didn't realize how low that external fan is.  Forget what I
said about closing off the top vent, you'll need to be drawing air in
there to allow cooling of the upper fins.  Side vent wants testing
but I suspect closing it would be good idea.  It may also be
necessary to restrict the bottom intake to get adequate flow past the
upper cooling fins.

Reversing the fan to blow into the cavity instead of out might work
better.  I presume there's a weather shield of some sort over the
fan?  If not you're guaranteed water in the cavity whichever way the fan blows.

Also, has the effect from the ventilation system in the moving
vehicle been tested?

Incidentally, back when I was playing with mine I put in a fan to
extract air from the upper vent or blow it in at the bottom and to my
surprise fridge performance dropped noticeably.  I forget the
numbers, but it was significant.  OTOH replacing the OEM rear fan
with the larger Fridge-Mate one and adding some quarter-inch
foil-sided vinyl siding backing improved things noticeably without
adding any noise or increased current draw (60 ma or so).

Yours,
David