Another person came here after his rant about closing this thread to state he had a same problem and get answer to his issue. Weird.
Another note, couple guys at work with cloth heated seat, and two trucks work till you can’t stand to sit in either seat, another two trucks do their own thing, one like the OP and one that only works on low.
Both guys “never noticed it”, until I asked about it.
2018 2500 6.4 4x4 4.10 Amsoil SS 0w-40, Softopper
Black Rhino Armory 18x9 +12mm
Cooper Stt MAXX LT295/70R18
2016 Durango 5.7 AWD 3.07 Amsoil SS 5W-30
1996 Nissan Altima 2.4 Amsoil SS 5W-30