Mazda 3 manuals

Mazda 3 Service Manual: Engine Coolant Replacement [Mzr 2.0, Mzr 2.5]

Mazda 3 Service Manual / Engine / Cooling / Engine Coolant Replacement [Mzr 2.0, Mzr 2.5]

WARNING:

CAUTION:

  1. Use engine coolant at a concentration that meets the environmental conditions in which the vehicle is driven, otherwise engine damage could occur.

  2. The engine has aluminum parts and must be protected by an ethylene-glycol-based coolant to prevent corrosion and freezing.

  3. Do not use coolants containing Alcohol, Methanol, Borate or Silicate. These coolants could damage the cooling system.

  4. Use only soft (demineralized) water in the coolant mixture. Water that contains minerals will cut down on the coolant's effectiveness.

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

NOTE:

1. Remove the cooling system cap.


2. Loosen 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.

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)

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


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

8. Install the cooling system cap.

CAUTION:

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

10. Bleed the air by following the procedures below. At this time, be careful of the coolant temperature to prevent overheating.

NOTE:

  1. 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 PCM control operation, which prevents overheating, and it does not indicate a malfunction.

a. Run the engine at 2,500 rpm

for 23 min

, 2 times

.

b. Run the engine at 3,000 rpm

for 5 s

, then idle.

c. Repeat steps (1), (2) twice.

11. Stop the engine, and inspect the engine coolant level after the engine coolant temperature decreases.

12. Check the coolant level.

13. Inspect for engine coolant leakage..

Engine Coolant Protection Inspection [Mzr 2.0, Mzr 2.5]
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 ...

Engine Coolant Temperature (ECT) Sensor Inspection [Mzr 2.0, Mzr 2.5]
ECT Sensor No.1 Resistance inspection WARNING: When the engine is hot, it can badly burn. Turn off the engine and wait until it is cool before removing the ECT sensor. 1. Remove the ...

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