INSUFFICIENT AIR (OR NO AIR) BLOWN FROM FRONT VENTS [CLIMATE CONTROL SYSTEM]

id0703k2900300

DESCRIPTION
•  Insufficient airflow from vent or duct
•  No airflow from vent or duct
•  Front airflow mode does not change
POSSIBLE CAUSE
•  Air filter clogging
•  Blower system malfunction
•  Air vent clogging
•  Duct malfunction
?  Deformation
?  Clogging
?  Air leakage
?  Bad installation
•  Front A/C unit malfunction
?  Front airflow mode link malfunction
?  Front airflow mode door malfunction
•  Evaporator frozen due to evaporator temperature sensor malfunction

Diagnostic procedure

Step

Inspection

Action
1
PERFORM CLIMATE CONTROL UNIT DTC INSPECTION
•  Perform the climate control unit DTC inspection using the M-MDS.
•  Are any DTCs displayed?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
No
Go to the next step.
2
INSPECT AIR FILTER FOR CLOGGING
•  Is the air filter clogged?
Yes
Replace the air filter.
Go to the step 10.
No
Go to the next step.
3
VERIFY FRONT BLOWER MOTOR OPERATION
•  Switch the ignition ON (engine off or on).
•  Set the airflow volume control switch to MAX.
•  Does the front blower motor rotate?
Yes
Replace the air filter.
Go to the step 10.
No
Go to the following symptom troubleshooting.
(See AMOUNT OF AIR BLOWN FROM FRONT VENTS DOES NOT CHANGE [CLIMATE CONTROL SYSTEM].)
4
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?
Yes
Go to the next step.
No
Go to the Step 7.
5
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?
Yes
Go to the next step.
No
Go to the Step 7.
6
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?
Yes
Go to the Step 9.
No
Go to the next step.
7
VERIFY DUCT INSTALLATION CONDITION
•  Is the duct under any of the following conditions? Clogging Deformation Air leakage Poor installation.
Yes
Install the incorrectly installed ducts properly, then go to step 10.
No
Go to the next step.
(See DASHBOARD REMOVAL.)
(See DASHBOARD INSTALLATION.)
(See FRONT HEAT DUCT REMOVAL/INSTALLATION.)
(See REAR HEAT DUCT No.1 REMOVAL/INSTALLATION.)
8
VERIFY FRONT AIRFLOW MODE LINK OPERATION
•  Remove the front airflow mode actuator.
•  Verify the operation by manually operating the front airflow mode link.
•  Does the front airflow mode link operate smoothly?
Yes
Replace the front A/C unit because there is a malfunction in the front airflow mode door.
(See FRONT A/C UNIT REMOVAL/INSTALLATION.)
(See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY.)
Go to the Step 10.
No
Replace the airflow mode link.
(See FRONT A/C UNIT REMOVAL/INSTALLATION.)
(See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY.)
Go to the Step 10.
9
VERIFY EVAPORATOR TEMPERATURE SENSOR
•  Inspect the evaporator temperature sensor.
•  Is the evaporator temperature sensor normal?
Yes
Go to the next step.
No
Replace the evaporator temperature sensor.
(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
(See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY.)
Go to the Step 10.
10
VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR
•  Is air discharged from vent?
Yes
Troubleshooting completed.
Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.