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It's a pretty easy job. Remove the front left plastic cover to access the coolant circulation pump and duovalve assembly. While the engine is warm and running, and the CC is set for heat, touch the coolant circulation pump to see if it's working. You should feel a slight vibration. Or, with everything off, remove the connector from the pump and check if there is continuity between the pump terminals. If there isn't, the motor windings are open. Time for a new pump. Pump can be bought for around $190 from online sources. MB manual states 0.8 hours to do the work.
Look through the link I attached in my earlier post. Although it describes the rear heater system, it will give you a better idea of what you're dealing with. The front is similar.
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1995 S600, 1 of 618 (sold)
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