I have experienced that same rumbling, very noticeable, which stops instantly when you turn climate off. I was wondering if that was normal, as my car is only three days new. Running version .31.
I don't have my car yet, but I'm thoroughly devouring this thread so I can keep up on what things to expect when I get it. One thing about the HVAC system is that yesterday I decided to *listen* to my HVAC in my ICE (4Runner). You know what?.. that thing makes a ton of strange noises, hisses, clunks, rumbles. I just never noticed them because of the engine noise, squeaky breaks, and fan belt squeals. I don't know if what you're hearing is different than that, but I can assure you, a regular HVAC system makes a lot of noise that I would not consider 'normal' and could not explain.
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