Sounds about right. The '07 I had the warmer was rather weak but eventually effective. My '10 F-150 Lariat has three settings: warm, roast, incinerate. I'm glad it has the butt cooler option, but as everyone learns do not break wind with the cooler fans on.
2013 Candy Red Mustang GT, 3.73, Rear camera, Brembo's, Boss tranny scoop, M-9603-MGTB FRPP tune, Borla stingers, M-5220-MB quad exhaust. Pending MGW shifter upgrade.
2007 Redfire Mustang GT...Sold but not forgotten