Warm armrest?
I only noticed this when we were driving for 3 plus hours and had the heater set to 70F automatic front and rear.
Note the climate control settings on the front center stack. Put your hand over the rear center console registers. Is the slightest tiniest bit of air coming out of the rear registers? This warms the front center armrest. Same phenomenon on 166 vehicles. Note that the above description is not related to the existence of rear zone electronic climate controls.
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It's part of the warmth and comfort package
If you don't have that package, it may be that your rear heat vents are closed, causing a build up of heat in the ducts, as others have suggested.








