Overheating '87 300D Turbo

[arnoneh]

Have not had a chance to troubleshoot this since it just happened and I had to get back to work, but my sedan just overheated and started dumping radiator fluid (about a quart or so?) out of the overflow hose. A quick check of the engine compartment didn't reveal any broken hostes that so my first thoughts were:
- the fluid was so low the engine overheated and it blew off this fluid as a result.
- the water pump stopped working causing the engine to overheat.

I've got to go troubleshoot this after work....Any other thoughts?

Thanks ahead of time for the help. -harv