Mercury F4ZZ-19805-C Motor - Cooling Blower

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For models without AC, remove the right register duct, ventilator control assembly, glovebox liner, and ventilator grille. Detach the ventilator assembly and remove the blower wheel and motor. To install, reverse these steps. For models with AC, remove the glovebox liner, disconnect the vacuum hose, remove the bolt securing the instrument panel, and the trim panel. Remove screws and nuts securing the blower housing and air inlet duct assembly. Disconnect the blower motor wiring and remove the mounting plate. If removed, reinstall the blower wheel, secure it, and install the blower motor. Tape the wiring to the air inlet duct, place the assembly back, connect the vacuum hose, then install the glovebox liner and secure the panels.

To disconnect the negative battery cable, squeeze the glove compartment sides to lower the door. Through the opening, unplug the blower motor by pressing the locking tabs and removing the connector. Unscrew the motor from the housing and remove it with the mounting plate, and, if replacing the motor, remove the clip and fan from the shaft and attach to the new motor. Finally, reconnect the battery, test the blower, and reset the glove compartment door.

To remove the blower motor without air conditioning, begin by taking out the glovebox and unscrewing the lower duct. Remove the hub clamp spring and blower wheel, and finally unscrew and disconnect the blower motor. Installation is the reverse of removal, with the hub clamp spring ends positioned 90-degrees from the motor shaft.

Make sure the battery is charged and the fuse is intact. Check the blower motor and resistor assembly connections. Check the fuse, connections, and battery. Connect a voltmeter to the blower motor connector and test the blower switch. If there is voltage but the blower motor isn't functioning or the readings are high, the motor may be faulty. Disconnect the blower motor resistor's connector, connect a jumper wire and an ammeter, and test the blower switch. If readings are high, the blower motor is likely faulty. If readings are off in one or two switch positions, the resistor assembly may be faulty.

To disconnect the negative battery cable, squeeze the glove compartment sides to lower the door. Through the opening, unplug the blower motor by pressing the locking tabs and removing the connector. Unscrew the motor from the housing and remove it with the mounting plate, and, if replacing the motor, remove the clip and fan from the shaft and attach to the new motor. Finally, reconnect the battery, test the blower, and reset the glove compartment door.

Remove the right ventilator assembly. Remove the hub clamp from the blower motor hub and withdraw the wheel assembly. Discard the hub clamp. Remove the screws securing the blower motor to the inside of the housing. Withdraw the motor and disconnect the motor's electrical connectors. Installation is the reverse of the removal with the addition of the following. Align the flat on the wheel hub with the flat on the motor shaft and install the blower wheel, Install a new hub clamp.