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I believe the upper vents are for A/C only. The floor vents are for the Hot air. Test your ceiling controls by moving the knob from cold to hot, you should hear the air pass from upper vents to lower vents. Providing of course you have selected REAR from the front control panel.

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Q: What can you do if you can't get heat from the rear upper vents in your 2001 Sienna?
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