I cleaned exhaust elbow, and cleaned manifold. White smoke is gone, but overheating not. I am now left, my opinion, with heat exchanger and thermostat. The flow of the seawater is stronger then it was before the cleaning, so I am more to the direction of faulty thermostat.
Do I have to drain a coolant from the engine to check on the thermostat?
#279 Bonne Anse in Portoroz