Hello everybody, JO, I already again and again my Omi has a problem that I have to solve . My Omi has a heat problem, not a serious one, but it annoys me immensely and maybe someone of you knows advice, I hope it. I am at the end with my Latin anyway. Because of the heat problem I have renewed the following in the last 14days – ZKD’s, Wapu, Thermostat and two days ago also a new water cooler. In between the water system was flushed and the climate condenser of Since the new cooler is in it, it has become a little better but not optimal as I would like it to be. The symptoms are the following: Outside temp. at 18° in the evening, thermostat opens according to the display at approx. 94°, water temp. falls down quite quickly to 91°, then rises again to approx. 94° and falls a second time off to approx. 92°. After that the temp. swings for about 4-5 km to 93-94°, then it can the temp. I don’t think it’s normal at least not on 13Km ride at about 50-60Km/h with only one or two short ampelstops. Even on the highway at 100km/h it keeps the temp. just at about 95°, I rise to 120km/h the temp. over 95°. I know each time the fan stops and climbs slowly but unstoppably over the 95° until the fan switches on at approx. 96° and then the temp. rises at approx. 98° and the water cools down again to 95°. In any case, I saw a very hard brown mud (say I have now) that I removed logically. That was at the right ZK. At the left ZK the hollow screw was clean. I guess that the previous owner used cooler density to cover a water loss before the sale. Could it be that on the right ZK a little bit of water was removed. I guess that the previous owner once used cooler density to cover a water loss before the sale. n water channel is closed or semi-slummed?? and therefore the temp. does not remain in the normal range?? What kind of hardcore cooler cleaner must be used to dissolve any such custations?? Hope I can help myself.