my 190e2.6 leaks coolant after a stop at the rear of the engine. I've traced this to the heater area, where some coolant is run through.
when the engine is stopped, the coolant circulation stops and the coolant temperature and pressure slightly increase because of the residual engine heat. This increase in pressure makes the coolant leak from a loose hose fitting somewhere in that heat exchanger.
sometime i will open up that part, tighten up that loose fitting, and oil my noisy fan as well ... in the meantime, i just check the water level periodically.