heater blower motor question

car was converted to factory a/c. i took the a/c portion off. only left the heater.

can't start the car right now...working on motor. but when i put the key in accessory and push the heat button with the fan switch set to OFF...the blower motor still spins very slowly...enough to feel air coming from the vents. is this normal? shouldnt the blower motor be OFF since the fan switch is OFF.

when i push the OFF button on the a/c controls the blower motor stops completely.

medium and high on the fan switch work fine.

am i missing something??