Similar problem as OP, but my rear fans still work, but just no hot air comes from them, just ambient temperature air.
I bought a FSR from RockAuto.com as an attempt to see. I just hope its not the blower motor itself

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S