On Jun 5, 2006, at 10:03 PM, joel walker wrote:

> if you mean the leftmost plastic tank (vw calls it the expansion
> tank), then it might just be a bad o-ring in the coolant level
> sensor or the pressure cap. and there's enough hydraulic pressure
> from the radiator being a few inches above the level of that tank
> to force coolant past a bad o-ring. especially when the system is
> warm.
>
> i don't recall a connection in the top of the overflow tank (the
> one behind the license plate).
>
> good luck!
> joel

Sorry, to clarify -- the leak is from the right-most tank.   Now that
I think about it, the only way for fluid to get into the right most
tank is to go through the pressure cap, right?   It's hard to imagine
that there'd be enough pressure when the van was simply sitting in
the sunlight.   Does this suggest a bad pressure cap rather than a leak?