Grand Cherokee 4WD V8-4.7L VIN N (2000)
Blower Motor: Testing and Inspection
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.
FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
Blower Motor Inoperative
Possible causes of an inoperative blower motor include:
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Faulty fuse
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Faulty blower motor circuit wiring or wire harness connections
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Faulty blower motor resistor (if the vehicle is so equipped)
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Faulty blower motor power module (if the vehicle is so equipped)
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Faulty blower motor switch
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Faulty heater-A/C mode control switch
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Faulty blower motor.
Blower Motor Does Not Operate In All Speeds
Possible causes of the blower motor not operating in all speeds include:
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Faulty fuse
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Faulty blower motor switch
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Faulty blower motor resistor (if the vehicle is so equipped)
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Faulty blower motor controller (power module) (if the vehicle is so equipped)
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Faulty AZC module (if the vehicle is so equipped)
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Faulty blower motor circuit wiring or wire harness connections.
Vibration
Possible causes of blower motor vibration include:
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Improper blower motor mounting
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Improper blower wheel mounting
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Blower wheel out of balance or bent
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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:
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Foreign material in the heater-A/C housing
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Improper blower motor mounting
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Improper blower wheel mounting
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Blower motor faulty.