my haynes manual says the following
disconnect the blower lead
remove the blower mounting screws and withdraw the motor and fan, it may be necessary to cut the flange sealing strip to release the blower motor from the firewall.
the fan can be removed from the motor shaft after the nut has been unscrewed.
Heater core and air distributor
disconnect the negative cable at the battery
place a suitable container under the heater core, disconnect the coolant hose from the core and plug them or fasten the ends up as high as possible so the coolant does not run out. Allow the coolant in the heater core to drain into the container.
remove the nuts from the distributor duct studs which project into the engine compartment. might be in the engine compartment??
remove the glovebox and door assembly
disconnect the air, defrost and temp door cables
remove the floor outlet and then remove the defroster duct to distributor duct screw
extract the screw retaining the heater distributor to the firewall
pull the heater assembly to the rear for access and disconnect the wiring harness
remove the heater air distributor
remove the core restraining straps and remove the core