As an engineer once famously said..
'It is the nature of fluids to leak."
( and sometimes leaks are intermittent )

think on the molecular level.

On 9/19/2013 4:58 PM, John Meeks wrote:
> This started about a month ago. I first noticed the overflow tank was low.
> I check the oil and coolant once a week so it had lost a few cups in a
> week. I filled the tank and hoped for the best.
>
> I drove it to work every day with no leaking. Next weekend Van was parked
> for 2 days and with the engine cold it lost the same amount overnight with
> a fast drip. It goes for days with no drips then randomly drops 1 or 2 cups
> in 8 hours or so.
>
> A couple of times it has done the fast drip while hot and pressurized then
> goes for days without a drip!
>
> I've checked all the hoses but it seems to be coming from the right head.
> In any case the engine is coming out next week but I'd really like to
> understand why it's all or nothing instead of a constant drip.  Any
> insights would be most welcome.
>
> John Meeks
> '91 Vanagon MV Phoenix
> Stock 2.1 250K miles
> Northern Michigan
>
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>
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>