DIAGNOSTIC PROCEDURE
NO.1 INSUFFICIENT AIR (OR NO AIR) BLOWN FROM FRONT VENTS DIAGNOSTIC
PROCEDURE
POSSIBLE CAUSE
z
Malfunction in front VENT mode system
z
Malfunction in front HEAT mode system
z
Malfunction in front DEFROSTER mode system
STEP
INSPECTION
ACTION
1
INSPECT FRONT AIRFLOW MODE
ACTUATOR
z
Is it okay?
Yes Go to the next step.
No Repair or replace malfunctioning part
in accordance with inspection result.
2
INSPECT TO SEE WHETHER MALFUNCTION
IS IN FRONT VENT MODE OR OTHER MODES
z
Does air blow out when in the front VENT
mode?
Yes Go to Step 5.
No
Go to the next step.
3
INSPECT FRONT VENT
z
Is the front vent clogged?
Yes Remove obstruction, then go to Step 9.
No
Go to the next step.
4
VERIFY THAT DUCT IN DASHBOARD IS
INSTALLED
z
Is the duct in the dashboard properly installed?
Yes
Inspect the duct for clogging,
deformation and air leakage, then go
to Step 9.
No Install the duct securely in the proper
position, then go to Step 9.
5
INSPECT TO SEE WHETHER MALFUNCTION
IS IN FRONT HEAT MODE OR FRONT
DEFROSTER MODE
z
Does air blow out when in the front HEAT
mode?
Yes Go to the next step.
No
Inspect the vent for clogging, then go
to Step 9.
6
INSPECT FRONT DEFROSTER MODE
z
Does air blow out when in the front
DEFROSTER mode?
Yes Operation is normal. Recheck
malfunction symptoms.
No
Go to the next step.
7
INSPECT FRONT VENT
z
Is the vent clogged?
Yes Remove obstruction, then go to Step 9.
No
Go to the next step.
8
VERIFY THAT DEFROSTER DUCT IS
INSTALLED
z
Is the defroster duct properly installed?
Yes
Inspect the duct for clogging,
deformation, and air leakage, then go
to the next step.
No
Install the duct securely in proper
position, then go to the next step.
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:14:50 AM
Page 4
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