I use "Max AC" initially for a few minutes. Then I select 70 degree temp and fan speed and the vents I want the air to come out of (usually the front and floor) and the system works good and cools you down quickly. In my experience, "Auto" mode just doesn't blow hard enough to keep you cool in a hot car since the system is dividing up the air flow through all the vents in the car. Once the car completely cools down to where I like it, then I may switch to Auto mode to maintain cabin temp.
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