That gurgling sound is a fearsome coolant troll.  Be prepared to ransom your
beloved basecamp before you can cross the bridge.

Sometimes they sound just like the coolant as it flows back into or from the
expansion tank, but not always.  They may take mirrored Ray-Bans in trade,
or they may not.

Now the question of the week...Why does the Vanagon have an expansion tank
and the rabbits jettae, passati and so on don't?