I think the AC blowing more air when turning could be the automatic climate control picking up some warm air in the Bronco as you turn. The air in the car doesn't necessarily turn when the car turns so if a pocket of warm air is read by a temperature sensor as you turn then the automatic AC will blow more cold air to cool the car off. Once it has run for a minute or two the air has again been cooled and the AC slows back down.
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