Mazda CX-9 Grand Touring. Manual - part 442

 

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Mazda CX-9 Grand Touring. Manual - part 442

 

 

10

Are the piping connections 
free of oil grime? (Visual 
inspection)  

Are the piping connections 
free of gas leakage?  

Are the piping installation 
points on the condenser free 
of gas leakage?  

Are the piping installation 
points on the receiver/drier 
free of gas leakage?  

Are the piping installation 
points on the A/C 
compressor free of gas 
leakage?  

Are the piping installation 
points on the A/C unit free of 
gas leakage?  

Perform gas leakage 
inspection using a gas leak 
tester.  

Are the above items normal?  

No

If the piping or A/C component (s) are damaged or 

cracked, replace them. 

Then go to Step 20. 

If there is no damage, go to Step 13.

11

INSPECT EVAPORATOR PIPING 
CONNECTION IN A/C UNIT FOR 
GAS LEAKAGE
  

Are piping the connections for the 
evaporator in the A/C unit free of 
gas leakage?  

Yes

If the vane makes a noise, add 10 ml {10 cc, 0.34 fl 
oz} of compressor oil to the A/C compressor. 
Verify that the noise is no longer heard. 
Adjust refrigerant to the specified amount, then go 
to Step 20.

No

If the piping is damaged or cracked, replace it. 

Then go to Step 20. 

If there is no damage, go to the next step.

12

INSPECT EVAPORATOR PIPING 
CONNECTION IN A/C UNIT FOR 
LOOSE
  

Are the piping connections for the 
evaporator in the A/C unit loose?  

Yes

Tighten the connections to the specified torque, 
adjust both compressor oil and refrigerant to the 
specified amount, then go to Step 20.

No

If the vane makes a noise, add 10 ml {10 cc, 0.34 fl 

oz} of compressor oil to the A/C compressor. 

Verify that the noise is no longer heard. 

Replace the O-ring on piping, adjust refrigerant to 

the specified amount, then go to Step 20.

13

INSPECT PIPING CONNECTION 
FOR LOOSE
  

Are the piping connections loose?  

Yes

Tighten the connections to the specified torque, 
adjust both compressor oil and refrigerant to the 
specified amount, then go to Step 20.

No

If the vane makes a noise, add 10 ml {10 cc, 0.34 fl 

oz} of compressor oil to the A/C compressor. 

Verify that the noise is no longer heard. 

 

2008 Mazda CX-9 Grand Touring 

2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:14:51 AM

Page 24 

© 2005 Mitchell Repair Information Company, LLC. 

Replace O-ring on piping, adjust refrigerant to 

specified amount, then go to Step 20.

14

INSPECT TO SEE WHETHER 
MALFUNCTION IS IN EXPANSION 
VALVE, AIR MIX ACTUATOR AND 
COMPRESSOR OIL OR 
ELSEWHERE
  

Does the refrigerant high-pressure 
value hardly increase?  

Yes Go to the next step. (Pressure hardly increases.)

No

Go to Step 17.

15

INSPECT TO SEE WHETHER 
MALFUNCTION IS IN 
COMPRESSOR OIL AMOUNT AND 
A/C COMPRESSOR OR 
ELSEWHERE
  

When the engine is racing, does the 
high-pressure value increase?  

Yes Return to Step 3.

No

Go to the next step.

16

INSPECT TO SEE WHETHER 
MALFUNCTION IS IN 
COMPRESSOR OIL AMOUNT OR 
A/C COMPRESSOR
  

After compressor oil is replenished 
each 10 ml {10 cc, 0.34 fl oz} , 
does high-pressure value increase?  

Yes

Troubleshooting completed. (Explain to customer 
that cause was insufficient compressor oil.)

No

Replace the A/C compressor, then go to Step 20. 

(Cause is defective A/C compressor.)

17

INSPECT TO SEE WHETHER 
MALFUNCTION IS IN EXPANSION 
VALVE OR ELSEWHERE
  

Is only refrigerant low-pressure 
value high?  

Yes Go to Step 19.

No

Go to the next step.

VERIFY THAT AIR MIX IS 
INSTALLED SECURELY AND 
PROPERLY
  

Yes

Set the fan switch to 4th position. 
Turn the A/C switch on. 
Set FRESH mode. 
Set temperature control to MAX COLD. 
Set VENT mode. 

1. Start and run the engine at 1,500 rpm for 10 

min.  

2. Run the engine at idle for 1 min.  

3. Within 12 s, idle -> 4,000 rpm -> idle. 

Perform cycle 5 times.  

4. Run the engine at idle for 30 s.  

5. Drain the compressor oil completely from the 

 

2008 Mazda CX-9 Grand Touring 

2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:14:51 AM

Page 25 

© 2005 Mitchell Repair Information Company, LLC. 

NO.9 NO COOL AIR FROM FRONT/REAR VENTS 

NO.9 NO COOL AIR FROM FRONT/REAR VENTS DESCRIPTION AND POSSIBLE CAUSE 

18

Are the front (driver and passenger 
side) and rear A/C unit air mix 
links, air mix cranks, and air mix 
rods securely and properly 
installed?  

A/C compressor and verify the amount.  

 

If there is approx. 90 ml {90 cc, 3.0 fl oz} of 
compressor oil, go to Step 20.  

If there is more than 90 ml {90 cc, 3.0 fl oz} 
of compressor oil, remove surplus oil and fill 
the A/C compressor with 90 ml {90 cc, 3.0 fl 
oz}
 of compressor oil. Repeat Steps (1) to 
(5).  

 
(Cause is excessive amount of compressor oil.)

No

Repair or install the links, cranks and rods securely 

in the proper position, then go to Step 20.

19

VERIFY THAT EXPANSION VALVE 
HEAT-SENSING TUBE WITHIN A/C 
UNIT IS POSITIONED SECURELY 
AND CORRECTLY
  

Is the expansion valve heat-sensing 
tube in the A/C unit securely 
installed in the proper position?  

Yes

Replace the expansion valve, then go to the next 
step. (Since the valve opens too much, replacement 
is necessary.)

No

Install the heat-sensing tube securely in the proper 

position, then go to the next step.

20

VERIFY THAT MALFUNCTION 
SYMPTOM OCCURS AFTER 
REPAIR
  

Does cool air blow out? (Are 
results of refrigerant system 
performance test normal?)  

Yes

Troubleshooting completed. 
Explain repairs to customer.

No

Recheck malfunction symptoms, then repeat from 

Step 1 if the malfunction recurs.

9

No cool air from front/rear vents

DESCRIPTION 

Malfunction in A/C compressor control system  

Magnetic clutch does not operate when the A/C system is turned ON.  

POSSIBLE CAUSE 

Malfunction in PCM A/C cut control system  

Malfunction in climate control unit  

Malfunction in refrigerant pressure switch  

Malfunction in PCM (A/C signal)  

Malfunction in PCM (IG1 signal)  

Malfunction in A/C compressor  

 

2008 Mazda CX-9 Grand Touring 

2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:14:51 AM

Page 26 

© 2005 Mitchell Repair Information Company, LLC. 

When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors 
while performing the inspection to discover whether poor contact points are the cause of any intermittent 
malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are 
connected correctly and undamaged.  

DIAGNOSTIC PROCEDURE 

NO.9 NO COOL AIR FROM FRONT/REAR VENTS DIAGNOSTIC PROCEDURE 

Malfunction in A/C relay  

Malfunction in evaporator temperature sensor  

Malfunction in BCM unit  

STEP

INSPECTION

ACTION

1

INSPECT AIR FLOW FROM VENTS  

Does air blow out?  

Yes Go to the next step.

No

Go to Step 1 of troubleshooting indexes 

No.1 and 2.

2

INSPECT A/C COMPRESSOR OPERATION 

Start engine.  

Turn A/C switch and fan switch on.  

Does A/C compressor operate?  

Yes

Go to Step 1 of troubleshooting index 
No.7.

No

Go to the next step.

3

INSPECT FOR DTC IN PCM  

Inspect for DTCs related to the PCM onboard 
diagnostic system.  

Are any DTCs displayed?  

Yes Go to appropriate inspection procedure.

No

Go to the next step.

4

INSPECT TO SEE WHETHER 
MALFUNCTION IS IN CLIMATE CONTROL 
UNIT OR ELSEWHERE
  

Does cool air blow out when terminal 1S of 
climate control unit connector (24-pin, A/C 
signal) is grounded?  

Yes

Replace climate control unit, then go to 
Step 16.

No

Release short, then go to the next step.

5*

INSPECT TO SEE WHETHER 
MALFUNCTION IS IN A/C SIGNAL 
CIRCUIT (BETWEEN REFRIGERANT 
PRESSURE SWITCH AND PCM) OR 
ELSEWHERE
  

Test voltage at following terminal of 
refrigerant pressure switch. 

Terminal B (A/C signal)  

Is voltage approx. 12 V?  

Yes Go to Step 7.

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 27 

© 2005 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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