Heating does not start in extreme cold

N’ Evening, it’s hardly a bit colder (in my case here in the north-east of the cold pole of Germany in the last days), already the (works-side) stand-up heating is ticking. Yesterday I noticed that she had to run from the time in the morning (-14 °C) but she didn’t do that (although the display said that the additional heating was running). Today I paid more attention to it: After switching on “turning up” as always. Then, however, if actually that “turbine noise” ” should use, it “clicks” at periodic intervals only under the car, which after a short time stops again (it then only remains an indicator). When driving, the (stand) heating switches to it after a certain time. After setting off immediately again tried out. And see there: The heating then also works standalone. So it looks as if the low temperatures in the completely cold car somehow affect the stationary heating. Is that what I wanted to do now, according to the motto “it’s not a bug it’s a feature”? Can’t I really believe it, though; the heating should be there to preheat the car (engine and interior). Problem is: Until I am at Ford it probably works again – and then to hear “We can’t do anything, we have to see (in case of warranty) with our own eyes”. And with the frost is soon over again. Maybe someone also has an experience? n Tip what it might be like (I was on December 31st – so it shouldn’t be on the diesel, it also drives quite normally). Greetings AnKa