Heater not working?

I had this happen to me this morning. At least it was only -5 degrees F. today! It would have been worse yesterday (-14F). I only discovered my blower wasn't working till I was a few miles from home. Man, that was a chilly 20 mile ride to work even with seat warmers on, I'm telling you. After I got feeling back in my hands and feet, I had a service writer bring my car into the shop and got it thawed out. The fuse wasn't blown, the tech thought the blower wheel was just frozen in the housing. I ordered the parts but they are both on a bad back order status. The retainers in the TSB are the same part number as the stock parts, so as long as they don't break they should be fine. I haven't seen them but I would think another retainer could be used in a pinch.