The car is 1992 300D.

I drove about 40 minutes. Ambient temperature gauge read 36*F, and the coolant temperature gauge read slightly below the middle of 80 and 100 (degrees C).

The coolant level was at the return hose. This means the level increased. I checked the level two months ago: at the middle when cold, 1~2 cm higher at operating temperature.

At the top of the coolant in the reservoir, there were foam.

The upper hose was hot (it felt like ~ 90*C), but the lower hose was not hot at all.

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.