My 1982 300SD engine takes very very long time to start getting just warm.
City traffic or highway will not make difference to a engine and coolant system to heat. I tried to put a cover over the radiator but it make no difference.
After driving almost 10 miles, the thermometer will not be above 50C.
Now that the winter is around it get even worse not having hot coolant to heat the air in the cabin.
On the other hand my 1984 300SD is just good on that. This 1984 driving just 5 miles local road it reach 80C very easy and I have a good heat in the cabin.
Can or not be the engine thermostat? Any other possible issue?
Thanks

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Nyck - TX - USA