Mercury 1L5Z-18456-CA Blower Assembly

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To check the blower motor circuit, inspect the fuse and connections for looseness or corrosion. Check the battery charge. Back probe the motor connector and connect a voltmeter. Observe voltage changes with the ignition On and blower switch cycled. If voltage is present but motor doesn't operate, test it separately. Check connectors and wires for faults. For the blower motor resistor assembly, visually check for damage and test continuity between terminals. Replace any open thermal limiter circuits. To check the blower switch, turn off ignition, disconnect resistor connector, and use an ohmmeter to check continuity to ground at each wire terminal. Replace a defective switch or address open wiring. For motor replacement, disconnect battery, move cruise control servo, disconnect motor connector, remove vent tube, and uninstall motor by removing screws, pushnut, and shaft clamp. Reverse steps for installation.

For a basic circuit check of the blower motor system, begin by inspecting the fuse and all circuit connections for looseness or corrosion, ensuring the battery is fully charged. Back probe the blower motor connector with two large straight pins while leaving the connector plugged in, then connect a voltmeter across the two pins. With the transmission in Park and the parking brake applied, turn the ignition switch to the On position (engine not running). Have an assistant cycle the blower switch through each position while noting the voltage readings, looking for changes in voltage to confirm that the blower switch can vary the motor speed at different positions. If voltage is present at the connector but the motor doesn't operate, test the motor separately by disconnecting the connector and connecting one terminal to a good ground and the other to the battery positive terminal through a fused jumper. The motor should run at its highest speed; if not, check connectors and wires. If the motor still doesn't run, it may be faulty. To check the blower motor resistor assembly, locate it on the heater case to the right of the blower motor, and visually inspect it for damage. Check the resistor block for continuity between all terminals and replace the thermal limiter circuit if it's been opened due to excessive heat.For a blower switch check, turn the ignition switch Off, disconnect the blower resistor electrical connector, and use an ohmmeter to check for continuity to ground at each wire terminal with the blower switch in its corresponding position, making sure the ignition switch is Off before probing the Hi-speed circuit. An open circuit in any position suggests a defective switch or an open wiring harness. Remove the control panel to check the switch for continuity, and if all switch positions show no continuity, verify continuity in the ground circuit.For blower motor replacement, disconnect the negative battery cable and, on 2001 and later models, move the cruise control servo aside by disconnecting its electrical connector and removing the mounting screw. Disconnect the blower motor connector and remove the vent tube if present. Then, remove the blower motor mounting screws, the blower motor wheel hub push nut, and the clamp from the shaft, and pull the blower motor wheel from the shaft. Installation is the reverse of these steps.

To troubleshoot the blower motor, start by checking the fuse and circuit connections for looseness or corrosion. Ensure the battery is fully charged and, with the ignition in the On position, switch the heater controls to FLOOR and test the blower at different speeds. The blower motor resistor assembly, mounted next to the blower motor, contains resistor elements for low and medium speeds. Visually check the thermal limiter for damage and test the resistor block for continuity; replace if necessary. Backprobe the pink/white wire at the blower motor for voltage. If voltage is present but the blower doesn't operate, check the ground circuit. Test the blower speed switch for continuity in different positions. Locate the blower motor relay behind the right headlight and check resistance; replace if needed. For models with a rear air circulation unit, remove the console trim, disconnect electrical connectors, and pull the console and blower housing out to access the blower motor for the rear seats.

The blower motor can be found on the right-hand side of the engine compartment. Take off the negative terminal wire from the battery. Remove the air cleaner for 1994 and earlier models. Push down on the electrical connector locking tab and disconnect that blower motor connector. Disconnect the small rubber cooling tube model without air conditioner from the blower motor. For models with air conditioning, remove a single nut from the bottom plenum. Disconnect the electrical connector from the blower motor resistor, vacuum hose from the check valve, and vacuum line from the intake manifold. Remove three screws that hold the blower motor to the heater blower assembly. Pull the blower motor out of the heater assembly. Remove the push nut on the motor shaft and remove the wheel if necessary. To install, reverse the above steps of removal process. Ensure fully seating electrical connector so it clicks into position.