Just had my car in the dealership last week for the same issue, although I made them replace the seat track due to excessive slop while it was there since it was under warranty
The blower only blows ambient air, I believe it runs when the seat heater is activated due to a cold back when the element was not functioning.
You can check the resistance of the element through the connector to see if it's broken.
I took my car in with 35,800 miles, just made it, Monday I promptly purchased a 7/100,000 mile warranty from Flood Ford.
No way I'm owning this car without one.