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I could be wrong, but I think the hvac system comes on at nearly full strength when the car is remotely started and settles into the last setting once you either open the door or push the ignition button. I usually leave my on auto and the fan is much higher when i first open the door than it would be if I started the car normally (not with remote start). There are also some settings in the menu you can adjust on how the system works when started remotely.
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