I read of others doing this, so tried it last Xmas when the car was back. Pot of water w/ silicate "coolant sealant", circulated w/ a 300D electric water pump. My son uses this 84 300D at college in San Diego, so he doesn't need much heat and a slight leak is tolerable. He won't answer whether the fix worked (ungrateful kid wants a new car). That same week, Car Talk had a call from a lady in Santa Cruz. They said "you don't need a heater, well maybe there, but not if you lived in San Diego". I don't think they even put heaters in the cars sold 20 miles away in Mexico.

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