Hello, I hope you can help me. With my Micra K13 Bj2012 80hp the heating on the dashboard and above is no longer warm for some time. Only in the footroom comes warm air out. In the city with slow drive or in the stand comes out some lukewarm air, on the highway only cool. Last week I was at Nissan and they looked under the dashboard and the flaps work. Pollen filter was replaced because it was “too” and the problem should be solved with it But it is not. As before, only warm air in the footroom. What could it be? I am grateful for every tip.