Dakota 4WD V8-4.7L VIN N (2000)
Blower Motor: Testing and Inspection
WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO AIRBAGS AND SEAT BELTS/AIRBAGS BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.
FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
Possible causes of an inoperative blower motor include:
-
Faulty fuse
-
Faulty blower motor circuit wiring or wire harness connectors
-
Faulty blower motor resistor
-
Faulty blower motor relay
-
Faulty voltage reduction relay
-
Faulty blower motor switch
-
Faulty heater-A/C mode control switch
-
Faulty blower motor.
Possible causes of the blower motor not operating in all speeds include:
-
Faulty fuse
-
Faulty blower motor switch
-
Faulty blower motor resistor
-
Faulty blower motor relay
-
Faulty blower motor circuit wiring or wire harness connectors.
VIBRATION
Possible causes of blower motor vibration include:
-
Improper blower motor mounting
-
Improper blower wheel mounting
-
Blower wheel out of balance or deformed
-
Blower motor faulty.
NOISE
To verify that the blower is the source of the noise, unplug the blower motor wire harness connector and operate the heater-A/C system. If the noise
goes away, possible causes include:
-
Foreign material in the heater-A/C housing
-
Improper blower motor mounting
-
Improper blower wheel mounting
-
Blower motor faulty.