
Dodge Durango
Service Manual
Heating and Air Conditioning » Diagnosis and testing
Blower motor
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS,
REFER TO PASSIVE RESTRAINT SYSTEMS
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.
For circuit descriptions and diagrams, refer to Air
Conditioning/Heater in Group 8W - Wiring Diagrams.
Possible causes of an inoperative front or rear blower
motor include:
- Faulty fuse (the rear blower motor fuse is
located in the relay and fuse block located on the
back of the junction block)
- Faulty blower motor circuit wiring or wire harness
connectors
- Faulty blower motor resistor
- Faulty blower motor relay (Voltage Reduction
Relay or VRR) (front only)
- Faulty blower motor switch
- Faulty heater-A/C mode control switch (front
only)
- Faulty high speed blower motor relay (front
only)
- Faulty blower motor.
Possible causes of the front or rear blower motor
not operating in all speeds include:
- Faulty fuse (the rear blower motor fuse is
located in the relay and fuse block located on the
back of the junction block)
- Faulty blower motor switch
- Faulty blower motor resistor
- Faulty blower motor relay (front only)
- Faulty blower motor circuit wiring or wire harness
connectors
- Faulty high speed blower motor relay (front
only).
VIBRATION
Possible causes of front or rear blower motor vibration
include:
- Improper blower motor mounting
- Improper blower wheel mounting
- Blower wheel out of balance or deformed
- Blower motor faulty.
NOISE
To determine that the rear blower is the source of
the noise, simply switch the blower motor from off to
on. There are no other moving parts involved in the
rear overhead A/C unit, which makes it simple to
identify the source of the noise. To verify that the front blower is the source
of the noise, unplug the
front 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.
More about «Diagnosis and testing»:
Blower motor