INSUFFICIENT AIR (OR NO AIR) BLOWN FROM VENTS [FULL-AUTO AIR CONDITIONER]
id0703c1700300
Troubleshooting item |
Insufficient air (or no air) blown from vents |
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Description
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• Insufficient airflow from vent or duct
• No airflow from vent or duct
• Airflow mode does not change
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Possible cause
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• Air filter clogging
• Blower system malfunction
• Air vent clogging
• Duct malfunction
• A/C unit malfunction
• Evaporator frozen due to evaporator temperature sensor malfunction
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Diagnostic Procedure
Step |
Inspection |
Action |
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1
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PERFORM DASH-ELECTRICAL SUPPLY UNIT DTC INSPECTION
• Perform the dash-electrical supply unit DTC inspection using the M-MDS.
(See DTC INSPECTION.)
• Are any DTCs displayed?
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Yes
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Go to the applicable DTC inspection.
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No
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Go to the next step.
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2
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INSPECT AIR FILTER FOR CLOGGING
• Is the air filter clogged?
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Yes
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Replace the air filter.
Go to step 10.
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No
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Go to the next step.
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3
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VERIFY BLOWER MOTOR OPERATION
• Switch the ignition ON (engine off or on).
• Set the airflow volume control switch to MAX.
• Does the blower motor rotate?
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Yes
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Go to the next step.
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No
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Go to the following symptom troubleshooting.
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4
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VERIFY AIRFLOW CONDITION
• Set the airflow mode to VENT mode.
• Turn the A/C switch off.
• Set the airflow volume control switch to MAX.
• Does sufficient air flow from the vents when the airflow mode is in VENT mode?
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Yes
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Go to the next step.
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No
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Go to Step 7.
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5
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VERIFY AIRFLOW CONDITION
• Set the airflow mode to HEAT mode.
• Turn the A/C switch off.
• Set the airflow volume control switch to MAX.
• Does sufficient air flow from the vents when the airflow mode is in 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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Go to Step 7.
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6
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VERIFY AIRFLOW CONDITION
• Set the airflow mode to DEFROSTER mode.
• Turn the A/C switch off.
• Set the airflow volume control switch to MAX.
• Does sufficient air flow from the vents when the airflow mode is in DEFROSTER mode?
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Yes
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Go to Step 9.
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No
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Go to the next step.
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7
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VERIFY DUCT INSTALLATION CONDITION
• Is the duct under any of the following conditions? Clogging Deformation Air leakage Poor installation
(See DASHBOARD REMOVAL [(E)].)
(See DASHBOARD INSTALLATION [(E)].)
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Yes
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Go to the next step.
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No
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Install the incorrectly installed ducts properly, then go to Step 10.
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8
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VERIFY AIRFLOW MODE LINK OPERATION
• Remove the airflow mode actuator.
• Verify the operation by manually operating the airflow mode link.
• Does the airflow mode link operate smoothly?
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Yes
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Replace the A/C unit because there is a malfunction in the airflow mode door.
Go to Step 10.
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No
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Replace the airflow mode link.
Go to Step 10.
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9
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VERIFY EVAPORATOR TEMPERATURE SENSOR
• Inspect the evaporator temperature sensor.
• Is the evaporator temperature sensor 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 evaporator temperature sensor.
Go to Step 10.
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Repair completion verification
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VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR
• Is air discharged from vent?
• Does air flow from the vent while in each airflow 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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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
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