Yes, its bad!
It is a lot of work to replace the heater core, no doubt. A weekend more or less. But, there is a step by step guide posted in this site:
http://www.peachparts.com/Wikka/W123Evaporator
That will get you right down to the heater core, I dont know if there any specifics to replacing it once you have the whole evaporator box out and apart.
dd
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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car
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