What does this rear HVAC control do?

[strider]

Hi everyone. I RTFM'd but they don't show a picture of the rear seat HVAC control options as viewed on the front screen. Can someone tell me what the highlighted control does in the picture below? When I move it I hear a change in airflow but I can't make out what it's doing or trying to tell me. Thanks!

 

[mxnym]

Based on how my 2017 X functions and the fact that you appear to have a 3rd row, I would expect this to control whether or not the outboard vents (B & C pillar vents?) are active. The original X had a separate condesnser and fans for these vents, but only when equipped with a third row (and there were [not supposed to be] outboard [B pillar?] vents on the vehicles with only 2 rows). The HVAC design for the plaid generation may vary in terms of the second row, but isn't likely to vary in terms of the third row. Also, FWIW, while that appears to be an on/off switch, it may also present itself differently if you happen to find a way out of auto re: rear fan settings.

 

[strider]

Thank you! @mxnym! I will put a kid back in the 3rd row and see if they can feel a change in airflow.

 

[fr100]

My guess would be the fan speed. I have the pre-refresh model and the rear climate fan speed is also separate from the front.

 

[mxnym]

Thank you! @mxnym! I will put a kid back in the 3rd row and see if they can feel a change in airflow.

Hopefully I accidentally helped. I thought you meant highlighted by Tesla and didn't notice your box around that bar. I do agree fan speed could still make sense, but they sure chose funny icons. If the fan speed on the front tab is in the same location and works the same way, then such context would help a lot.