When we turn off an engine that is at operating temp, the engine
part is HOT HOT HOT and the coolant in the engine - near the
heads- will try & boil & expand.  If there is a release for the pressure
(pressure raises the boiling point) then the coolant will boil and "pee"
out at the weakest spot.  While driving, the coolant is circulating and
will (should) not boil,  When you stop for the gas the coolant temp
raises, expands, and finds the weakest link and "pees" forth. Good
luck.  Malcolm

On 27 Feb 2002 at 11:55, James Shinosky wrote:

> My 88 weekender has been drive fine until at the gas station after i
> shut off the engine, it peed coolant from somewhere near the
> waterpump. I filled the coolant reservior with water and it runs fine
> back home, no overheat. Till I get on the driveway and shut off the
> engine, it pees coolant... How come it runs fine but when the engine
> shut off, it pees??? Help!
>
> Jim
> W88kender
> La la land