Nice work on the vid, I have to finish up my hitch install yet, wonder if mine will have the same fitment problem.
I've hit high 80F here and coolant temp max hits 190F. I haven't setup the scan gauge to monitor the inverter temps yet which is more what is effected by the lower grill.
I go about 5 mils and it hits around 170F, maybe a little warmer with the warmer weather.
I mounted the trailer connector box to the passenger side body with the provided double sided tape. I routed the wire so it can be tucked away next to the battery and is still long enough to reach the trailer hitch area. The place you used seems like a better spot though. I wanted it far away from things that are common to be moved around and the concept of putting it to the body is it might give a slight cooling effect, of course in the sun it's going to heat it up, so maybe not the best idea lol.
Good luck with the BMW project.
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