Hello itsnotanova,
fans threshold: I don't know if the fan relais gets an analog or a digital bus signal in your car. If it's analog voltage signal you can use a voltage divider to modifiy the signal. If it's an digital bus signal you can use a port sniffer to detect the signal and manipulate the input of the relais via a bus controller. The other option would be to reprogram the DME. But i don't know if there is an option in PIWIS developer mode to do this on your DME model.
Arenared: these dark metallic colors are really difficult to paint. Best is to blend in the new color in old color and do an overall new clearcoat.
Regards
Markus
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