NO.6 INSUFFICIENT AIR (OR NO AIR) BLOWN REAR VENTS
id070300802000
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6
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Insufficient air (or no air) from rear vents
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DESCRIPTION
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• Problem with each rear vent and/or duct
• Rear airflow mode does not change when front and/or rear climate control unit mode switches.
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POSSIBLE CAUSE
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• Rear vent mode malfunction
• Rear heat mode malfunction
• Rear airflow mode actuator malfunction
• Open, short circuit in wiring or poor connection between front and rear climate control unit
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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INSPECT TO SEE WHETHER MALFUNCTION IS IN VENT MODE
• Does air blow out when in the rear vent mode?
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Yes
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Go to the Step 6.
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No
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Go to the next step.
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2
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VERIFY THAT REAR HEATER CONTROL USING FRONT CLIMATE CONTROL UNIT
• Turn the rear heater to ON and OFF using the front A/C control panel.
• Is it possible that the rear heater turns ON and OFF using the front climate control unit?
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Yes
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Go to Step 4.
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No
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Go to the next step.
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3
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INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN, SHORT OR POOR CONNECTION OF TERMINALS BETWEEN FRONT AND REAR CLIMATE CONTROL UNIT) OR ELSEWHERE
• Inspect for open, short or poor connection of terminals between front and rear climate control unit.
• Is there any open, short or poor connection of terminals?
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Yes
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Repair or replace malfunctioning part, then go to Step 10.
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No
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Go to the next step.
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4
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INSPECT VENT
• Is the vent clogged?
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Yes
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Remove obstruction, then go to Step 10.
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No
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Go to the next step.
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5
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VERIFY THAT REAR A/C DUCT IS INSTALLED
• Is the rear A/C duct properly installed?
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Yes
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Inspect the duct for clogging, deformation and air leakage, then go to Step 10.
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No
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Install the duct securely in the proper position, then go to Step 10.
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6
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INSPECT TO SEE WHETHER MALFUNCTION IS IN REAR HEAT MODE
• Does air blow out when in the rear heat mode?
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Yes
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Go to the next step.
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No
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Inspect the rear vent for clogging, then go to Step 10.
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7
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INSPECT REAR VENT
• Is the rear vent clogged?
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Yes
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Remove obstruction, then go to Step 10.
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No
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Go to the next step.
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8
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INSPECT REAR AIRFLOW MODE ACTUATOR
• Inspect the rear airflow mode actuator.
• Is the rear airflow mode actuator normal?
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Yes
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Go to the next step.
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No
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Replace the rear airflow mode actuator, then go to Step 10.
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9
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INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN, SHORT OR POOR CONNECTION OF TERMINALS BETWEEN FRONT CLIMATE CONTROL UNIT AND REAR AIRFLOW MODE ACTUATOR) OR ELSEWHERE
• Inspect for open, short or poor connection of terminals between front climate control unit and rear airflow mode actuator.
• Is there any open, short or poor connection of terminals?
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Yes
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Repair or replace malfunctioning part, then go to next step.
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No
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Replace the front climate control unit, go to the next step.
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10
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VERIFY REPAIR
• Does air blow from the rear A/C vent mode?
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Yes
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Troubleshooting completed.
Explain repairs to customer.
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No
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Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.
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