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Mazda CX 7. Manual - part 114

COOLING SYSTEM [L3 WITH TC]

01-12–11

01-12

THERMOSTAT REMOVAL/INSTALLATION[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. Disconnect the negative battery cable.
2. Drain the engine coolant. (See 01-12-5 ENGINE COOLANT REPLACEMENT[L3 WITH TC].)
3. Remove the front splash shield (RH).
4. Remove the charge air cooler duct. (See 01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH

TC].)

5. Remove the drive belt. (See 01-10-3 DRIVE BELT REMOVAL/INSTALLATION[L3 WITH TC].)
6. Remove the P/S oil pump with hose and pipe still connected. Position the P/S oil pump out of the way. (See 06-

14-21 POWER STEERING OIL PUMP REMOVAL/INSTALLATION.)

7. Remove in the order indicated in the table.
8. Install in the reverse order of removal.
9. Refill the engine coolant. (See 01-12-5 ENGINE COOLANT REPLACEMENT[L3 WITH TC].)

10. Inspect for engine coolant leakage. (See 01-12-6

ENGINE COOLANT LEAKAGE INSPECTION[L3
WITH TC].).

End Of Sie

THERMOSTAT INSPECTION[L3 WITH TC]

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1. Inspect the thermostat for the following.

Warning

• During inspection, the thermostat and water are extremely hot and can cause severe burns. Do not

touch the thermostat and water.

• The valve should not open under normal temperature.

• Opening temperature and valve lift

— If there is a malfunction, replace the thermostat.

Thermostat initial-opening temperature

80— 84

°C {176— 183 °F}

Thermostat full-open temperature

°C {207 °F}

Thermostat full-open lift

More than 8.0 mm {0.31 in}

Water hose

Lower radiator hose

Thermostat component

Gasket

N·m {kgf·cm, in·lbf}

8.0—11.5
{82—117,
71—101}

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COOLING SYSTEM [L3 WITH TC]

01-12–12

End Of Sie

WATER PUMP REMOVAL/INSTALLATION[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.

TC].)

5. Loosen the water pump pulley bolts before removing the drive belt.
6. Remove the drive belt. (See 01-10-3 DRIVE BELT REMOVAL/INSTALLATION[L3 WITH TC].)
7. Remove in the order indicated in the table.
8. Install in the reverse order of removal.
9. Refill the engine coolant. (See 01-12-5 ENGINE COOLANT REPLACEMENT[L3 WITH TC].)

10. Inspect for engine coolant leakage. (See 01-12-6

ENGINE COOLANT LEAKAGE INSPECTION[L3
WITH TC].).

O-ring Installation Note

1. Apply engine coolant to a new O-ring.
2. Install the O-ring.

End Of Sie

FAN MOTOR REMOVAL/INSTALLATION[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.

Water pump pulley

Water pump

O-ring
(See 01-12-12 O-ring Installation Note.)

N·m {kgf·m, ft·lbf}

8.0—11.5 N·m
{82—117 kgf·cm,
71—101 in·lbf}

17—23
{1.8—2.3,
13—16}

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COOLING SYSTEM [L3 WITH TC]

01-12–13

01-12

1. Disconnect the negative battery cable.
2. Remove the under cover.
3. Drain the engine coolant. (See 01-12-5 ENGINE COOLANT REPLACEMENT[L3 WITH TC].)
4. Remove the charge air cooler duct, air cleaner and fresh air duct component. (See 01-13-5 INTAKE AIR

SYSTEM REMOVAL/INSTALLATION[L3 WITH TC].)

5. Remove the coolant reserve tank. (See 01-12-7 COOLANT RESERVE TANK REMOVAL/INSTALLATION[L3

WITH TC].)

6. Remove the dipstick pipe. (See 01-11-6 OIL PAN REMOVAL/INSTALLATION[L3 WITH TC].)
7. Remove in the order indicated in the table.
8. Install in the reverse order of removal.
9. Refill the engine coolant. (See 01-12-5 ENGINE COOLANT REPLACEMENT[L3 WITH TC].)

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

N·m {kgf·cm, in·lbf}

1.8—3.3
{18—34,
16—29}

1.8—3.3
{18—34, 16—29}

2.7—5.0
{28—50,
25—43}

4.9—7.9
{50—80,
44—69}

5.9—8.3
{61—84, 53—72}

7.8—10.8 {80—110, 70—95}

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Fan control module connectors

Fan control module No.2

Upper radiator hose

Wiring harness

ATF oil cooler pipe
(See 01-12-14 ATF Oil Cooler Pipe Removal Note.)

Cooling fan component
(See 01-12-14 Cooling Fan Component Removal
Note.)

Fan control module No.1

Cooling fan No.1

Cooling fan No.2

Cooling fan motor No.1

Cooling fan motor No.2

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COOLING SYSTEM [L3 WITH TC]

01-12–14

ATF Oil Cooler Pipe Removal Note

1. Remove the ATF oil cooler pipe with the hoses still connected. Position the ATF oil cooler pipe so that it is out of

the way.

Cooling Fan Component Removal Note

1. Remove the cooling fan component from above the engine compartment.

End Of Sie

FAN MOTOR INSPECTION[L3 WITH TC]

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Part Inspection

1. Verify that the battery is fully charged. (See 01-17-2 BATTERY INSPECTION[L3 WITH TC].)
2. Remove the charge air cooler duct. (See 01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH

TC].)

3. Disconnect the cooling fan motor connector (2 terminals).
4. Install a tester and battery to the cooling fan

motor connector (2 terminals) as shown in the
figure.

5. Verify that each fan motors operate smoothly at

the standard current.

• If there is any malfunction, replace the

applicable part.

Cooling fan motor No.1, No.2 standard current

17.5— 22.5 A

End Of Sie

WM: COOLANT RESERVE TANK

WM: COOLING SYSTEM CAP

WM: FAN CONTROL MODULE

FAN CONTROL MODULE INSPECTION[L3 WITH TC]

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1. Remove the charge air cooler duct. (See 01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH

TC].)

2. Connect the M-MDS to the DLC-2.
3. Start and warm up the engine.
4. Monitor the engine coolant temperature with the

M-MDS.

5. Measure the voltage at terminal A of the fan

control module connector (2 terminals) as shown
in the table.

• If not within the specification, inspect the input

signals from the following parts.

— Crankshaft Position (CKP) sensor

— Engine Coolant Temperature (ECT)

sensor

— Throttle Position (TP) sensor

— Refrigerant pressure switch (middle)

COOLING FAN
MOTOR
NO.1, NO.2
CONNECTOR

COOLING FAN MOTOR NO.1, NO.2 CONNECTOR

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DLC-2

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FAN CONTROL MODULE NO.1, NO.2 CONNECTOR

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Content .. 112 113 114 115 ..