Thanks all for your help. Found both items: thermostat and engine block coolant drain plug. Not like my problems were solved though.
Thread continued here: Overheating '84 300SD
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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver
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