Mazda CX-9 Grand Touring. Manual - part 144

Fig. 6: Identifying Cooling System Cap Mark 
Courtesy of MAZDA MOTORS CORP. 

1. Remove the cooling system cap. 

Fig. 7: View Of Cooling System Cap 
Courtesy of MAZDA MOTORS CORP. 

2. Remove the radiator drain plug and drain the engine coolant into a container.  

3. Flush the cooling system with water until all traces of color are gone.  

4. Let the system drain completely.  

5. Tighten the radiator drain plug. 

Tightening torque  

1.5-2.4 N.m {15-25 kgf.cm, 13-12 in.lbf}

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Cooling System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 9:57:25 AM

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© 2005 Mitchell Repair Information Company, LLC. 

Fig. 8: Identifying Radiator Drain Plug 
Courtesy of MAZDA MOTORS CORP. 

6. Referring to the following chart, select the correct volume peroentage of the water and engine coolant. 

Antifireeze solution mixture percentage (Execpt FLI22 type engine coolant)  

WATER AND COOLANT VOLUME PERCENTAGE CHART 

7. Refill the engine coolant into the coolant reserve tank up to the F mark on the tank.  

8. Install the cooling system cap. 

9. Start the engine and warm up the engine by idling.  

10. After the engine warms up, perform the following steps. AT this time, be careful of the engine coolant 

Engine coolant protection

Volume percentage (%)

Gravity at 20°C {68°F}

Water

Coolant

Above - 16°C {3°C}

65

35

1.057

Above - 26°C {-15°F}

55

45

1.072

Above -40°C {40°F}

45

55

1.086

CAUTION:



If the water temperature gauge mises too high, stop the engine 
and decrease the engine coolant temperature to prevent 
overtheating. Then, verify the malfunctionining part and repair 
or replace it.  



If the engine coolant level in the coolant reserve tank is below 
the L mark during engine coolant air bleeding operation, stop 
the engine, and after the engine coolant temperature decreases, 
add engine coolant. Then, resume the engine coolant air 
bleeding operation.  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Cooling System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 9:57:25 AM

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© 2005 Mitchell Repair Information Company, LLC. 

temperature to prevent overheating. 

1. Run the engine at approx. 4,000 rpm for 1 min.  

2. Run the engine at idle for 1 min.  

3. Repeat steps (1), (2) approx. 2 times.  

4. Operate the heater at the maximum temperature and airflow, and verify that hot air blows from 

werit.  

11. Stop the engine, and inspect the engine coolant level after the engine temperature decrease. If it is low, 

repeat steps 7 - 10.  

12. Inspect for engine coolant leakage. (See ENGINE COOLANT LEAKAGE INSPECTION [MZI-3.7].) 

ENGINE COOLANT LEAKAGE INSPECTION [MZI-3.7] 

1. Inspect the engine coolant level. (See ENGINE COOLANT LEVEL INSPECTION [MZI-3.7].)  

2. Remove the cooling system cap.  

3. Install the SST and a radiator cap tester to the coolant reserve tank filler port.  

4. Apply pressure using the radiator cap tester. 

NOTE:



If the accelerator pedal is depressed confiously for a speciffed time, 
the engine speed may decrease to the idle speed. This is does not 
indicate a malfunction.  

WARNING:



Never remove the cooling system cap or loosen the radiator drain 
plug while the engine is running, or when the engine and radiator are 
hot. Scalding engine coolant and steam may shoot out and cause 
serious injury. It may also damage the engine and cooling system.  



Turn off the engine and wait until it is cool. Even then, be very 
careful when removing the cap. Wrap a thick cloth around it and 
slowly turn it counterclockwise to the first stop. Step back while the 
pressure escapes.  



When you are sure all the pressure is gone, press down on the cap 
using the cloth, turn it, and remove it.  

CAUTION:



Applying more than 122.6 kPa {1.25 kgf/cm

2

 , 17.8 psi} can 

damage the hoses, fittings, and other components, and cause 
leakage.  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Cooling System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 9:57:25 AM

Page 9 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 9: Applying Pressure With Radiator Cap Tester 
Courtesy of MAZDA MOTORS CORP. 

Engine coolant leakage inspection pressure 122.6 kPa {1.25 kgf/cm

2

 , 17.8 psi} [1 min] 

 

5. When pressurizing the cooling system, verify that the pressure is maintained. 



If the gauge needle drops, it may indicate water leakage. Repair or replace the applicable part.  

COOLING SYSTEM CAP INSPECTION [MZI-3.7] 

1. Clean the cooling system cap and the sealed part.  

2. Inspect the cooling system cap for cracks or everted seal. 



If there is any malfunction, replace the cooling system cap.  

3. Attach the cooling system cap to the SST and a radiator cap tester.  

4. Hold the cooling system cap downward and apply pressure gradually. Verify that the pressure is held 

stable for 10 s. 



If the pressure is not held stable, replace the cooling system cap.  

Cooling system cap valve opening pressure 93.2-122.6 kPa {0.95-1.25 kgf/cm

2

 , 13.5-17.8 psi}

 

WARNING:



Never remove the cooling system cap or loosen the radiator drain 
plug while the engine is running, or when the engine and radiator are 
hot. Scalding engine coolant and steam may shoot out and cause 
serious injury. It may also damage the engine and cooling system.  



Turn off the engine and wait until it is cool. Even then, be very 
careful when removing the cap. Wrap a thick cloth around it and 
slowly turn it counterclockwise to the first stop. Step back while the 
pressure escapes.  



When you are sure all the pressure is gone, press down on the cap 
using the cloth, turn it, and remove it.  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Cooling System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 9:57:25 AM

Page 10 

© 2005 Mitchell Repair Information Company, LLC.