Mine does the same thing. I noticed it first last winter when the temp
got to freezing. It's intermittent but usually presents itself when it
gets below freezing. Always goes away when it warms up. I generally
don't see a leak if I drive daily. When it goes undriven for several
days or more (during cold weather) it comes back. I have another
engine that I hope to get installed some day (I have no free time).
Until then I live with it since it's pretty minor.

Mark K
1986 GL/2WD/4SPD

On Dec 16, 2009, at 7:34 PM, Dave Mcneely wrote:

> First really cold weather of the winter last week.  Started up the
> van,
> only to see a coolant drip underneath.  Methinks, well, a loose
> clamp on
> a hose, not tightened adequately.  Take off the lid, search all over
> for
> a hose leaking.  Nada.  Continue searching, coolant drip diminishing.
> Stops.
>