RAM 3500 Van V8-5.9L VIN Z LDC (1998)
Blower Motor: Testing and Inspection
WARNING: ON VEHICLES EQUIPPED WITH AIR BAGS, REFER TO 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 front or rear blower motor include:
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Faulty fuse
of 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 (front only)
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Faulty high speed blower motor relay
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Faulty blower motor.
Possible causes of the front or rear blower motor not operating in all speeds include:
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Faulty fuse
-
Faulty blower motor switch
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Faulty blower motor resistor
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Faulty blower motor relay
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Faulty blower motor circuit wiring or wire harness connectors
-
Faulty high speed blower motor relay.
Vibration
Possible causes of front or rear 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 deformed
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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 front or rear heater-A/C housing
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Improper blower motor mounting
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Improper blower wheel mounting
-
Blower motor faulty.
