Within a few blocks, we definitely feel the heat on the hi setting in our 2014. Low, not so much, barely feel it. Usually what we do is set them on hi to begin with, and once they are too warm, turn it to low, and it seems to work better.
2014 Jeep Grand Cherokee Limited 4x4
5.7L Hemi V8, Luxury Group II, Navigation
Hemifever Tuned, Billet Catch Can, 265/60R18 Hankook Dynapro ATMs