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Engine Cooling System: Diagnosis Mazda CX-5 I

Cooling System (Mechanical) 6 illustrations ~502 words

ENGINE COOLANT LEVEL INSPECTION [SKYACTIV-G 2.0]

WARNINGNever 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 Mazda Genuine FL22 engine coolant. FL22 type engine coolant is shipped as a diluted solution. Use the solution as is when replacing coolant.

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3
Scheme 3
  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 F and L marks. If the engine coolant level is below the L mark, add engine coolant. (Scheme 2): Identifying "FL22" Mark On Cooling System Cap (Scheme 3): Identifying Coolant Reserve Tank F And L Coolant Level Marks

ENGINE COOLANT LEAKAGE INSPECTION [SKYACTIV-G 2.0]

WARNINGNever 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.

Scheme 4

Scheme 4
Scheme 4
  1. Inspect the engine coolant level. (See «ENGINE COOLANT LEVEL INSPECTION [SKYACTIV-G 2.0]»(ref-615406-S23530699362014051000000) ).
  2. Remove the cooling system cap.
  3. Install the radiator cap tester to the radiator filler neck.
  4. Apply pressure using the radiator cap tester. CAUTION: Applying more than 122.6 kPa {1.250 kgf/cm 2,17.78 psi} can damage the hoses, fittings, and other components, and cause leakage. Engine coolant leakage inspection pressure 122.6 kPa {1.250 kgf/cm 2, 17.78 psi} [1 min] (Scheme 4): Applying Pressure To Radiator Filler Neck Using Radiator Cap Tester
  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 [SKYACTIV-G 2.0]

WARNINGNever 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.

Scheme 5

Scheme 5
Scheme 5
  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 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 {0.951-1.250 kgf/cm 2, 13.6-17.7 psi} (Scheme 5): Applying Pressure To Cooling System Cap Using Radiator Cap Tester

Scheme 6

Scheme 6: COOLANT RESERVE TANK REMOVAL/INSTALLATION [SKYACTIV-G 2.0]
Scheme 6: COOLANT RESERVE TANK REMOVAL/INSTALLATION [SKYACTIV-G 2.0]
  1. Remove in the order indicated in the table.
  2. Install in the reverse order of removal. (Scheme 6): Identifying Coolant Reserve Tank, Hose And Wiring Harness

Scheme 7

Scheme 7: Coolant Reserve Tank Removal Note
Scheme 7: Coolant Reserve Tank Removal Note
  1. Remove the coolant reserve tank from the radiator cowling tabs shown in the figure by lifting them with a flathead screwdriver. (Scheme 7): Identifying Coolant Reserve Tank Radiator Cowling Tabs

THERMOSTAT INSPECTION [SKYACTIV-G 2.0]

  1. Remove the thermostat. (See «THERMOSTAT REMOVAL/INSTALLATION [SKYACTIV-G 2.0]»(ref-615406-S17740417332014051000000) ).
  2. Visually check that the thermostat valve is closed.
  3. Place the thermostat in water. WARNING: During inspection, the thermostat and water are extremely hot and can cause severe burns. Do not touch the thermostat and water.
  4. Heat the water and check the following. Opening temperature and valve lift If there is a malfunction, replace the thermostat. Thermostat initial-opening temperature 80.5-83.5°C {177-182°F} Thermostat full-open temperature 95°C {203°F} Thermostat full-open lift 8.5 mm {0.33 in} or more

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