Water pump.

You will find a small amount of coolant at the bottom weep hole (you will have to use a dental mirror to see it) and will find coolant dripping off the oil pan about half way down. The coolant leaks out of the pump, down the front of the engine, and down the side of the block along the oil pan and drips off there.

Yours is leaking badly hot, I'd not drive it until you can replace it. If you MUST, you will have to drive with the tank cap loose (unless it drips more then....) and keep a close eye on the temp guage. No slow heavy traffic driving, either!

Do not overheat the engine....

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!