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Rear vent heating

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I noticed on several occasions that the rear air vent (for rear passenger) was blowing warm air, while the front driver went was blowing apparently cool AC air. This morning it happened when it was 72 degrees outside, and the AC was set to auto at 72 degrees.

Questions:

1. Are there separate heating elements for the back air vent?
2. How does the car decide when to heat? I really don't need heating when it is 72 degrees.