Rear vents, hot vs cold

[FloridaMan655321]

So here in Florida I've been able to test the heating of the Lightning recently. Yes, it happens down here because we are weak. I've noticing something strange though. The rear vents don't really blow any heat out at all, even at high it barely comes out, like barely enough to get the physical vents warm. The day I noticed this, by the time I drove home from work I needed to lower the temp and I felt the rear vents and air was coming out fine. I tested this again the following day with the same results. Now keep in mind with all the humidity we have, I had the AC button enabled no matter if the temp was set to 80 or 60.

Anyone else have this issue? Any logic to this? I haven't tested the rear floor vents, just the rear seats that I can touch while driving.

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[Tclark5]

Heat typically come out of rear floorboard vents, the system changes accordingly to the mode its in. The face vents are tied to the upper rear seat vents.