Mazda 6. Manual — part 114

COOLING SYSTEM SERVICE WARNINGS, ENGINE COOLANT

E–3

E

COOLING SYSTEM SERVICE WARNINGS

A6E361001004W01

Warning

• Never remove the radiator cap or loosen the radiator drain plug while the engine is running, or

when the engine and radiator are hot. Scalding 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.

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ENGINE COOLANT LEVEL INSPECTION

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1. Verify that the coolant level in the coolant reservoir is between the F and L marks.

• If the engine coolant level is below L, remove the radiator cap and add coolant. (See

E–3 COOLING

SYSTEM SERVICE WARNINGS

.)

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ENGINE COOLANT PROTECTION INSPECTION

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

Caution

• The engine has aluminium parts that can be damaged by alcohol or methanol antifreeze. Do not

use alcohol or methanol in the cooling system. Use only ethylene-glycol-based coolant.

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

reduce the coolant effectiveness.

2. Determine the coolant protection by referring to

the graph shown.

• If the coolant protection is not proper, add

water or coolant.

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COOLING SYSTEM SERVICE WARNINGS

ENGINE COOLANT

40%

50%

30%

1.100

1.090

1.070

1.060

1.050

1.040

1.030

1.020

1.010

1.000

1.080

-10

0

10 20 30

40 50

60 70 80 90

{50} {68}

{140} {158}

{86}

{176}

{32}

{122}

{14}

{104}

{194}

COOLANT TEMPERATURE

°C {°F}

SPECIFIC
GRAVITY

COOLANT PROTECTION

0

A6A3612W100

E–4

ENGINE COOLANT

ENGINE COOLANT REPLACEMENT

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Warning

• Drain the engine coolant while the engine is cold, otherwise it may burn you and cause serious

injury.

1. Remove the radiator cap.

2. Remove the radiator drain plug.
3. Drain the coolant into a container.
4. Flush the cooling system with water until all

traces of color are gone.

5. Let the system drain completely.
6. Tighten the radiator drain plug.
7. Referring to the following chart, select proper

volume percentage of the water and coolant.

Antifreeze solution mixture percentage

8. Slowly pour the coolant into the radiator up to the coolant filler port.
9. Fill the coolant into the reservoir up to the FULL mark on the coolant reservoir.

10. Fully install the radiator cap.

Caution

• If the coolant temperature becomes too high, stop the engine to prevent it from overheating.

11. Start the engine and let it idle until the cooling fan operates.
12. After engine warms up, perform the following steps.

(1) Run the engine at 2,500 rpm for 5 min.
(2) Run the engine at 3,000 rpm for 5 s, then return to idling.
(3) Repeat Step (2) several times.
(4) Run the engine at idle for 1 min.

13. Stop the engine and wait until it is cool.
14. Remove the radiator cap.
15. Check the coolant level.

• If It is low, repeat Steps 8—15.

16. Install the radiator cap.
17. Inspect for coolant leakage.

• If not as specified, repair or replace the radiator cap.

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ENGINE COOLANT LEAKAGE INSPECTION

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Warning

• Never remove the radiator cap while the engine is running, or when the engine and radiator are

hot. Scalding 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

Coolant protection

Volume

percentage

Gravity at

20

°C

{68

°F}

Water

Coolant

Above –16

°C {3 °F}

65

35

1.054

Above –26

°C {–15°F}

55

45

1.066

Above –40

°C {–40 °F}

45

55

1.078

AME3612W001

AME3612W002

ENGINE COOLANT, RADIATOR CAP

E–5

E

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 coolant level.
2. Remove the radiator cap.
3. Clean the mounting surface of the rediator cap and the upper radiator hose.
4. Connect a radiator cap tester and the radiator cap tester to the reservoir filler port.
5. Apply specified pressure to the radiator.

Pressure

127 kPa { 1.3 kgf/cm

2

, 18 psi}

6. Verify that the pressure is held.

• If not, inspect the system for coolant leakage.

— If the coolant leaks from the upper hose

attachment part, replace the upper hose
and the clamp.

— If the coolant leaks from the main body of

the radiator (caulking part), replace the
radiator.

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RADIATOR CAP INSPECTION

A6E361415201W01

Warning

• Never remove the radiator cap while the engine is running, or when the engine and radiator are

hot. Scalding 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. Clean the radiator cap negative pressure valve and tha sealed part.
2. Inspect the crack or turn over on sealed of the radiator cap.

• If not as specified, repace the radiator cap.

3. Fill the radiator cap test adopter with the water or the engine coolant to the full level and attach the radiator cap

to the adapter.

4. Hold the radiator cap downward and apply

pressure gradually. Verify that the pressure
become held for 10 s within the specification.

• If the pressure will not stable within the

specification, replace the radiator cap.

Pressure

113—142 kPa

{ 1.1—1.4 kgf/cm2, 15—20 psi}

AME3612W003

RADIATOR CAP

AME3614W001

E–6

RADIATOR

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RADIATOR REMOVAL/INSTALLATION

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1. Disconnect the negative battery cable.
2. Drain the engine coolant. (See

E–4 ENGINE COOLANT REPLACEMENT

.)

3. Remove the cooling fan. (See

E–9 COOLING FAN REMOVAL/INSTALLATION

.)

4. Remove the oil hose. (ATX)
5. Remove in the order indicated in the table.
6. Install in the reverse order of removal.
7. Refill the engine coolant. (See

E–4 ENGINE COOLANT REPLACEMENT

.)

8. Inspect the engine coolant leakage. (See

E–4 ENGINE COOLANT LEAKAGE INSPECTION

.)

.

End Of Sie

RADIATOR

AME3616W001

1

Water hose

2

Radiator