Mazda CX 7. Manual — part 112

COOLING SYSTEM [L3 WITH TC]

01-12–3

01-12

ENGINE COOLANT LEVEL INSPECTION[L3 WITH TC]

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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.

Note

• If the “FL22” mark is shown on or near the cooling system cap, use FL22 type engine coolant.

• FL22 type engine coolant is shipped as a

diluted solution (55% coolant, 45% water).
Use the solution as is when replacing
coolant.

1. Remove the cooling system cap.
2. Verify that the engine coolant is filled close to the top of the radiator filler neck.

• If the engine coolant level is low, add engine coolant.

3. Verify that the engine coolant level in the coolant

reserve tank is between the FULL and LOW
marks.

• If the engine coolant level is below the LOW

mark, add engine coolant.

End Of Sie

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COOLING SYSTEM [L3 WITH TC]

01-12–4

ENGINE COOLANT PROTECTION INSPECTION[L3 WITH TC]

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1. Measure the engine coolant temperature and specific gravity using a thermometer and a hydrometer.

Caution

• Use engine coolant at a concentration that meets the environmental conditions in which the

vehicle is driven, otherwise engine damage could occur.

• The engine has aluminum parts and must be protected by an ethylene-glycol-based coolant to

prevent corrosion and freezing.

• Do not use coolants containing Alcohol, Methanol, Borate or Silicate. These coolants could

damage the cooling system.

• Use only soft (demineralized) water in the coolant mixture. Water that contains minerals will cut

down on the coolant’s effectiveness.

• Engine coolant damages paint. If engine coolant does get on a painted surface, rinse it off quickly.

Note

• If the “FL22” mark is shown on or near the cooling system cap, use FL22 type engine coolant.

• FL22 type engine coolant is shipped as a

diluted solution (55% coolant, 45% water).
Use the solution as is when replacing
coolant.

2. Determine the engine coolant protection level by

referring to the graph shown in the figure.

• If the engine coolant protection level is not

correct, add water or engine coolant.

End Of Sie

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1.09

1.08

1.07

1.06

1.05

1.04

1.03

1.02

1.01

1.00

0

5

10 15 20 25 30 35 40 45 50

55%

45%

35%

1.10

SPECIFIC
GRAVITY

COOLANT PROTECTION
(EXCEPT FL22 TYPE ENGINE COOLANT)

COOLANT TEMPERATURE

°C {°F}

{68}

{59}

{32}

{41}

{50}

{77}

{86}

{95} {104} {113} {122}

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COOLING SYSTEM [L3 WITH TC]

01-12–5

01-12

ENGINE COOLANT REPLACEMENT[L3 WITH TC]

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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

• Use engine coolant at a concentration that meets the environmental conditions in which the

vehicle is driven, otherwise engine damage could occur.

• The engine has aluminum parts and must be protected by an ethylene-glycol-based coolant to

prevent corrosion and freezing.

• Do not use coolants containing Alcohol, Methanol, Borate or Silicate. These coolants could

damage the cooling system.

• Use only soft (demineralized) water in the coolant mixture. Water that contains minerals will cut

down on the coolant's effectiveness.

• Engine coolant damages paint. If engine coolant does get on a painted surface, rinse it off quickly.

Note

• If the “FL22” mark is shown on or near the cooling system cap, use FL22 type engine coolant.

• FL22 type engine coolant is shipped as a

diluted solution (55% coolant, 45% water).
Use the solution as is when replacing
coolant.

Engine coolant capacity (approx. quantity)

9.0 L {9.5 US qt, 7.9 Imp qt}

1. Remove the cooling system cap.
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 with a new gasket.

Tightening torque

1.5— 2.4 N·m {15— 25 kgf·cm, 13— 21 in·lbf}

6. Referring to the following chart, select the correct

volume percentage of the water and engine
coolant.

Antifreeze solution mixture percentage (Except FL22 type engine coolant)

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RADIATOR DRAIN PLUG

COOLING SYSTEM CAP

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Engine coolant protection

Volume percentage (%)

Gravity at 20

°C {68 °F}

Water

Coolant

Above -16

°C {3 °F}

65

35

1.057

Above -26

°C {-15 °F}

55

45

1.072

Above -40

°C {-40 °F}

45

55

1.086

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COOLING SYSTEM [L3 WITH TC]

01-12–6

7. Refill the engine coolant from the radiator filler neck until it is close to the top of the radiator filler neck.
8. Refill the engine coolant into the coolant reserve tank up to the FULL mark on the tank.
9. Install the cooling system cap.

Caution

• If the water temperature gauge rises too high, stop the engine and decrease the engine coolant

temperature to prevent overheating. Then, verify the malfunctioning part and repair or replace it.

10. Start the engine and warm up the engine by idling.
11. After the engine warms up, perform the following steps. At this time, be careful of the engine coolant

temperature to prevent overheating.

Note

• If the accelerator pedal is depressed continuously for a specified time, the engine speed may decrease to

the idle speed. This is due to the fuel cut control operation, which prevents overheating, and it does not
indicate a malfunction.

(1) Run the engine at approx. 5,000 rpm for 1 min.
(2) Run the engine at idle for 5 s.
(3) Repeat steps (1), (2) several times.
(4) Operate the heater at the maximum temperature and airflow, and verify that hot air blows from vent.

12. Stop the engine, and inspect the engine coolant level after the engine coolant temperature decreases. If it is

low, repeat steps 7— 11.

13. Inspect for engine coolant leakage. (See 01-12-6 ENGINE COOLANT LEAKAGE INSPECTION[L3 WITH TC].)

End Of Sie

ENGINE COOLANT LEAKAGE INSPECTION[L3 WITH TC]

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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.

1. Inspect the engine coolant level. (See 01-12-3 ENGINE COOLANT LEVEL INSPECTION[L3 WITH TC].)
2. Remove the cooling system cap.
3. Install the SST and a radiator cap tester to the

radiator filler neck.

4. Apply pressure using the radiator cap tester.

Caution

• Applying more than 142.2 kPa {1.45 kgf/

cm

2

, 20.6 psi} can damage the hoses,

fittings, and other components, and
cause leakage.

Pressure

142.2 kPa {1.45 kgf/cm

2

, 20.6 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.

End Of Sie

WM: COOLING FAN MOTOR

49 9200 145

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