My 2016 EB has the same issue. Glad to see a TSB on this.... Takes 15 minutes to feel anything cool at all (and basically useless) - no effect on lumbar or back of seat as well....
Registered here just to confirm my 2016 M/T PP 2.3 has similar issues. 8k miles on it now, and from 50 - 70 mph it begins to roar and vibrate enough to make the cars in the rear view mirror blurry, and very noticeable in the steering wheel and seat. Certainly feels driveline related to me as...