>>Also if it rains or if one goes through a car wash without the vent cover,
>>where does the water go inside the van? Does it drain somewhere or does it
>>get stuck inside the van to create potential rust problems?
>
>It fills up your refrigerator flue which sits there full of water until you
>open the drain plug at the front of the fridge and drain it all out.
>

I bought one about a year ago from TBD for about $10.  It lasted about a
month and then blew off/got stolen.  Haven't replaced it since.  Haven't
tried the margerine tub trick. Don't see the need, to be honest.

I wash the car every one to two weeks or so, plus the car sits outside in
the rain.  I have never had anything drain out of that drain plug.  Even
when the fridge has been running...  (and yes it is clear, because I can
blow air into it and into the combustion chamber....

My $0.02, FWIW

Brent Christensen
'89 GL Syncro Westy
Santa Barbara, CA

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