RAM 3500 Truck 4WD L6-5.9L DSL Turbo VIN C (2002)
Blower Motor: Testing and Inspection
For circuit descriptions and diagrams. 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 a/c heater 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 relay
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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 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 HVAC system. If the noise goes
away, possible causes include:
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Foreign material in the HVAC housing
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Improper blower motor mounting
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Improper blower wheel mounting
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Blower motor faulty.