Coolant Leak Mystery 92 500sel

[DaveL]

Hmmm. So, it all started when I decided to check the water level, and then drove off without putting on the radiator cap. I only drove a couple miles, and when I stopped there was lots of water running out, and I realized what I had done, so I waited a few hours and then refilled it and drove off (hoping it was all normal, but it wasn't...)

Now, it acts weird. It seems to leak a little coolant most times when I stop the car.

Yesterday, I drove 100 miles under varied conditions. When I stopped, it didn't leak. Then I drove another 50 miles, varied (hiway and city), and when I stopped, no leak. Then I drove 3 miles, and when I stopped it dropped a quart of coolant.

It seems that if I drive extended periods, it works fine. Short distances cause it to spit up.

It doesn't seem to spit up when running, regardless of conditions.

Yes, I have tried to bleed it when filling (putting it on a hill, running the heater, etc.).

Any help or guidance (or guesses...)...

Thanks

-David
92 500sel
86 560sel
85 535i
82 QPorte