Heater blower (page 2 of 2)

The blower motor (C056-1) is connected by a slate and black wire to the resistor pack (C425-4) and the heater motor switch (C058-1). The blower motor switch has five connections for the heater blower operation. A black wire from the blower motor switch (C058-5) completes the earth path to earth header joint (C550-5). With the blower motor switch in position 0 (off), the earth path is not complete and the blower motor will not operate.

With the switch in position 1, current flows through the blower motor to the resistor pack (C425-4). The current flows through a 2.6 Ohms resistor in the resistor pack (C425-3) and is connected by a green and black wire to the blower motor switch (C058-2). The current passes to earth via switch connection (C058-5). The resistor limits the current flow through the blower motor which operates in slow speed mode.

With the switch in position 2, current flows through the blower motor to the resistor pack (C425-4). The current flows through a 1.32 Ohms resistor in the resistor pack (C425-1) and is connected by a pink and black wire to the blower motor switch (C058-6). The current passes to earth via switch connection (C058-5). The resistor limits the current flow through the blower motor which operates in medium speed mode.

With the switch in position 3, current flows through the blower motor to the resistor pack (C425-4). The current flows through a 0.27 Ohm resistor in the resistor pack (C425-2) and is connected by a yellow and black wire to the blower motor switch (C058-3). The current passes to earth via switch connection (C058-5). The resistor limits the current flow through the blower motor which operates in fast speed mode.

With the switch in position 4, current flows through the blower motor and is connected with the blower motor switch (C058-1) by a slate and black wire. The current passes to earth via switch connection (C058-5). Because the feed through the motor is direct to the switch, the motor operates at full speed.