Hello dear community, I drive a 2004 V8. Since the last temperature fall I realize that the heating power of my thickness is no longer the one I am used to. When the automatic is switched on it no longer heats at all and with manuel only very weak at the lowest fan level. If I turn the fan upwards only cold air comes up. It also does not change if I correct the temperature upwards. Does any of you have an idea of what this can be? Thanks for the Help Krocko