Cherokee 2WD L6-4.0L VIN S (1998)
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 AIR-BAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
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 connectors
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Faulty blower motor resistor
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Faulty blower motor relay
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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.
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
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Faulty blower motor circuit wiring or wire harness connectors.
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