Is the engine block coolant drain plug the huge plug with an electrical connection plugged into it? I noticed I have to remove that connection in order to fully get to it. And it is huge! Is that it?
The problem I am having with my '84 300SD is that it is overheating. When I drive it on the highway at 70mph for about 15 minutes or even less, the temperature gauge goes to 100 C. Then a few minutes later it can go to 110C and stay there. I haven't noticed any decrease in engine performance, and neither have I smelled coolant burning, but I consulted a man well experienced with Mercedes-Benzes and he told me that the engine was running too hot (just like I was thinking). So now I'm in the process of flushing out the entire cooling system, replacing the thermostat, seal and housing gasket.
What suggestions do you have for me? I read several pages of search results here and now all the plans I have come from my research results.
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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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