Blower Motor: Testing and Inspection

INSPECTION

MODE SELECTION DAMPER CONTROL MOTOR AND POTENTIOMETER CHECK

CAUTION:
Do not apply battery voltage when the damper is in the FACE or DEF position.





Check the mode selection damper control motor and potentiometer by the following procedures.






POTENTIOMETER CHECK

While checking the mode selection damper control motor and potentiometer, measure the resistances between terminal numbers 3 and 5 and between terminal numbers 3 and 7. At this time, the resistances should change gradually within the standard value.

Standard value: 0.8 (DEF) - 4.8 (FACE) kohms


OUTSIDE/INSIDE AIR SELECTION DAMPER CONTROL MOTOR CHECK





CAUTION:
Cut off the battery voltage when the damper is in the inside/outside air position.

Check the outside/inside air selection damper control motor by the following procedures.






BLOWER FAN AND MOTOR CHECK





When battery voltage is applied between the terminals, check that the motor operates. Also, check that there is no abnormal noise.

RESISTOR CHECK





Use an ohmmeter to measure the resistance between the terminals. Check that the measured value is at the standard value.
Standard value: