NO.6 INSUFFICIENT AIR (OR NO AIR) BLOWN REAR VENTS
NO.6 INSUFFICIENT AIR (OR NO AIR) BLOWN REAR VENTS DESCRIPTION AND POSSIBLE
CAUSE
DIAGNOSTIC PROCEDURE
*11
INSPECT WIRING HARNESS BETWEEN FRONT
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR SHORT TO B+
z
Turn the ignition switch to the ON position
z
Measure the voltage at the following front climate
control unit terminals.
{
Terminal 10 (RECIRCULATE signal)
{
Terminal 1M (FRESH signal)
z
Is the voltage
approx. 12 V?
Yes
Repair the wiring harness between
the front climate control unit and air
intake actuator, then go to Step 14.
No
Replace the front climate control
unit, then go to Step 14.
12
INSPECT A/C UNIT AIR INTAKE DOOR
z
Is there any foreign material or obstruction in the
A/C unit air intake door?
Yes Remove obstruction, then go to
Step 14.
No
Go to the next step.
13
VERIFY THAT A/C UNIT AIR INTAKE DOOR IS
POSITIONED SECURELY AND PROPERLY
z
Is the A/C unit air intake door securely and
properly positioned?
Yes
Inspect the air intake door for
cracks or damage, then go to the
next step.
No
Install the air intake door securely
in the proper position, then go to
the next step.
14
VERFY REPAIR
z
Does the malfunction disappear?
Yes Troubleshooting completed.
Explain repairs to customer.
No
Recheck malfunction symptoms,
then repeat from Step 1 if the
malfunction recurs.
6
Insufficient air (or no air) from rear vents
DESCRIPTION
z
Problem with each rear vent and/or duct
z
Rear airflow mode does not change when front and/or rear climate control
unit mode switches.
POSSIBLE
CAUSE
z
Rear vent mode malfunction
z
Rear heat mode malfunction
z
Rear airflow mode actuator malfunction
z
Open, short circuit in wiring or poor connection between front and rear
climate control unit
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:14:50 AM
Page 16
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