That is not the defroster fan. That is the A/C fan. The defroster fan is completely separate. It is mounted on the engine bulkhead. You can NOT see it without removing the air conditioning box and duct work.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now