A further note:

Please use only MB or Zerex G-05 coolant. It appears that the anti-corrosives in the "green" coolant both cause corrosion problems long term in iron/aluminum engines AND cause the plastic in the radiator tanks to become brittle.

I've done several of these in the last couple years.

Get a new rad pronto, DO NOT take a long trip until you do, else you will surely fail what's left of the hose nipple, and likely seriously overheat the engine. This will very likely require a complete rebuild, something you definitely want to avoid.

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!