Disconnect the negative (-) battery terminal.
Remove the crash pad and heater blower unit.(Refer to HA group-heater unit)
Remove the heater blower unit from crash pad. (Refer to HA group - "Heater Unit")
Remove the blower unit (A) from the heater unit after loosening a mounting bolt and screws.
Make sure that there is no air leaking out of the blower and duct joints.
Installation is the reverse order of removal.