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Discussion Starter #1
Whenever I switch on the front defroster in my 2019 570S, the blower motor goes to the highest speed and the A/C comes on. I understand that this is for quick defrosting, but on my other cars I can dial back the fan speed to a lower setting. But when I do that on the 570S, the defroster turns off. What am I missing?
 

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Suppose to be this way. For very quick windscreen defrost. Just the way Mclaren does it. Possibly a safety thing. Air conditioning needs to be on to work. Otherwise just blowing air and not removing moisture.
When winding back system may be designed as to know you are now finished with defrost??
 

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Discussion Starter #3
Thanks, makes sense.
I still like the way the other cars work that when I am done with defrost I can keep the fan low with A/C on to keep some defrost function and keep the fog away without having to turn it back on
 

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Most every car I had works this way.
 
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