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I just saw this first-hand while at a vacation house. The car was in the sun and the AC had kicked on to keep the car under ~105 degrees. Also keep in mind that the gen2 portable connector can sense outlet plug temp and may also throttle down the speed if the temperature gets too high.
As a member of Apple's Developer Program, I have access to the new iOS 13 beta released yesterday. I was curious if anyone has tried it yet with the Tesla app (checking to make sure I don't break my primary car key before testing it).
---peter
I just got my M3 LR AWD on Friday and was told the same thing - annoyed but I never planned on keeping my phone that low anyway (bought a dash mount off of Amazon)