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Hello, I am curious to understand what is this black mechanism inside the rear right wall of the Sienna? Thanks
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Yes, the right rear cup holder is noticeably warmer due to engine coolant circulating to the rear heater.
 

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Is this what explains why the cup holders are often hot in the rear? I see some pipes. Are they connected to the front engine for heat exchange?
I have never noticed that. Probably because my third-row seats are only up a couple of times per year, and then only for a couple of hours, so nobody has needed the cup holders.

Actually, the right-side cup holder is in use all the time. That is where I store my little jump-pack battery thingy. I run its charger cord back to the power port so it's ALWAYS ready.

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