1987 300TD Wagon - where did all my coolant go????

[Chewable]

I had a large puff of white smoke come out of my wagon on startup and was about 2 miles from home. I got home and the temp was a little high most of the way and the reserve(filler) tank looked very low.

I let the car sit for about 3 hours and went to the auto parts store. The temp got to just below about 105 on the way there. I added fluid (almost a gallon) and it was topped up.

I drove about 4 miles to a friends house. At about 2 miles the temp started to really climb. It sat at 80 and then started to really shoot up.

About 1 mile from my friends house it hit the 120 mark and kept going.

I made it to their house and let the car sit. We went to a movie and I called a tow truck to get me home.

There is no coolant in there again. I did not see any draining out. When I go to my friends it was all steaming out.

Is the water pump dead?
I cant think of any other reason that there is no coolant and no obvious leaks. I did not see any coolant on the dip stick and it did not look foamy or small of coolant.

It really seems like it just superheated and boiled all away. Although the smell was not super strong.

I will fill the tank in the morning again and see if I can see any leaks.

Could the radiator be plugged?