In your picture of the t stat housing, I see what looks like the remnants of a paper gasket around the housing..if that is what there is ,was there a rubber gasket that fits around the t stat it self..If you are trying to seal the housing with a paper gasket and the t stat has no rubber ring on it like my picture, then the t stat will let coolant by it and the car will never warm up.
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1978 300SD 303400 miles
1983 300D 341270 miles
1980 300SD 320456 miles
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