coolant filled - still no heat. i found a leak - actually didn't find it yet but discovered that coolant is leaking, somewhere below the thermostat, i can see it collecting on the top of what looks like the oil pan.

with the coolant filled to the brim, i started the car and let it idle. it did not overheat as before. the coolant leaked slowly. at one point when the heat was above 80c i stepped on the accelerator for a second and the coolant temp went down.

could be the water pump?

what lies below the thermostat, attached to the engine?

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1984 300D "Brown (and Blue) Betty" Over 200k but the odometer isn't counting