Re: HVAC Blower
Welcome to the garage.
Sitting without a battery will not do anything to the blower motor rotation. The blower motor controller was not changed lately?
Other then that, the only thing i can come up with is the recirculation door, which can be laying on top of the blower. Remove the blower motor and look up. If you see the door, try to move it up by hand. If it does without much force, the door hinge is broken and the door blocks the blower outlet.