servus, since the temperature problems have become more and more severe in recent times, today I went to the cooling system and cleaned it properly, because the water looked quite disgusting. I opened the drain screw on the cooler and emptied a part of the cooling system. a rather disgusting broth will come out. before I had in a bottle water a (attention: no joke!) two-phase dishwasher tab dissolved and the solution + water into the circuit tipped. motor run la food, heating completely turn up (automatic air conditioning on “hi” temperature, ventilation on stage 1), so that the valves are fully open and also flushed there. allow the whole soup to circulate for a good 10 minutes with running motor & closed balance tank. without lid the water is not warm enough, the system pressure is necessary.In between check again and again whether the thermostat has opened. continue to open the drain screw with running motor and at the same time keep the balance fill it with pure fresh water until rel. clear water comes. after a short time, the thermostat will close again. let the motor cool off & let it cool, drain screw back up and drain water out. fill the cooling system again with clear water and let it run. it should not circulate ice-cold water into a hot block! this can cause cracks in the cylinder head. the water should look a little better now, so let the motor run up thermostat again, drain screw on and off top fresh water. very important: repeat the washing process until the water no longer forms foam! this dishwasher crepe must be completely out again! also the thermostat should be open as always as possible, otherwise the broth does not come out everywhere again. close the cooler over the flow empty, 4.5 l glycantine pure and fill up with water. cool system properly ventilate and is good. effect so far: temperature needle is at gaaaaaanz just above 90 grad fixed (before 95 – 98) and goes after 10 min empty run to 92,5. simply try out, cool water should be changed anyway every two years. Greetings, Thorsten