NO.6 INSUFFICIENT AIR (OR NO AIR) BLOWN REAR VENTS DIAGNOSTIC PROCEDURE
STEP
INSPECTION
ACTION
1
INSPECT TO SEE WHETHER MALFUNCTION IS IN
VENT MODE
z
Does air blow out when in the rear vent mode?
Yes Go to the Step 6.
No
Go to the next step.
2
VERIFY THAT REAR HEATER CONTROL USING
FRONT CLIMATE CONTROL UNIT
z
Turn the rear heater to ON and OFF using the front A/C
control panel.
z
Is it possible that the rear heater turns ON and OFF using
the front climate control unit?
Yes Go to Step 4.
No
Go to the next step.
3
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
z
Inspect for open, short or poor connection of terminals
between front and rear climate control unit.
{
Terminal 3E (front)-terminal A (rear)
{
Terminal 3G (front)-terminal C (rear)
{
Terminal 3H (front)-terminal D (rear)
{
Terminal 31 (front)-terminal E (rear)
{
Terminal 3C (front)-terminal F (rear)
z
Is there any open, short or poor connection of terminals?
Yes
Repair or replace
malfunctioning part, then go
to Step 10.
No
Go to the next step.
4
INSPECT VENT
z
Is the vent clogged?
Yes
Remove obstruction, then go
to Step 10.
No
Go to the next step.
5
VERIFY THAT REAR A/C DUCT IS INSTALLED
z
Is the rear A/C duct properly installed?
Yes
Inspect the duct for
clogging, deformation and
air leakage, then go to Step
10.
No
Install the duct securely in
the proper position, then go
to Step 10.
6
INSPECT TO SEE WHETHER MALFUNCTION IS IN
REAR HEAT MODE
z
Does air blow out when in the rear heat mode?
Yes Go to the next step.
No
Inspect the rear vent for
clogging, then go to Step 10.
7
INSPECT REAR VENT
z
Is the rear vent clogged?
Yes Remove obstruction, then go
to Step 10.
No
Go to the next step.
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:14:51 AM
Page 17
© 2005 Mitchell Repair Information Company, LLC.
