I have to say the glass on the BMWs are way weaker than what i've what ive had in other cars in terms of negating heat. Im not in extreme in LA but when I have been in my current 4 series the sun coming through has been a lot more intense than what i've found in other cars. I think that's just a big a problem as the AC... which i will say is also weaker than what i have found from other manufacturers.
I have also found more engine and electronic heat permeate the cabin in the BMWs of recent than other brands, so there are like heat zones near the nav and what I assume coming from the engine. I used to be able to run my other cars without any sort of AC on but with the BMW if i don't it will fog up.
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