I had the car packed up for a road trip. Filled it up with biodiesel. Got in the car, drove 10ft. And the blower suddenly stopped.

The AC pump still engages when the AC is turned on.

There was no sign of blower motor wear.

No symptoms prior to this.

The fuses are all good.

No defrost or high fan settings get it to turn on.

If it is set to EC I can feel outside air coming in when the car is moving fast.

I had to transfer my family and all our stuff to our other car and head out. When I get back I want to fix it.

Any ideas on what it might be or what to check?

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1991 350SD (updated rods)
Biodiesel B100 when I can find it.
Dino when really cold outside