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Home >> Mazda >> 2021 >> MX-5 Miata Club, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Cooling System) >> Engine Coolant Replacement

Engine Coolant Replacement

WARNING: This page is about a different car, the 2016 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
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:
  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:
  • If the "FL22" mark is shown on or near the cooling system cap, use Mazda Genuine FL22 type engine coolant.
    Fig 1: Identifying FL22 Mark On Cooling System Cap
    G10951621Courtesy of MAZDA MOTORS CORP.
  • FL22 type engine coolant is shipped as a diluted solution. Use the solution as is when replacing coolant.

    Engine coolant capacity (approx. quantity) 

  • MT: 6.0 L {6.3 US qt, 5.3 Imp qt}
  • AT: 5.9 L {6.2 US qt, 5.2 Imp qt}
  1. Remove the cooling system cap.
  2. Drain the engine coolant from the coolant reserve tank.
  3. Set aside the air hose and air cleaner cover as a single unit with the air flow sensor connector connected. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
    Fig 2: Setting Aside Air Hose And Air Cleaner Cover
    G10951622Courtesy of MAZDA MOTORS CORP.
  4. Remove the air cleaner case and resonance chamber No. 1 as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
  5. Connect the specified hose (hose inner diameter: 7 mm {0.3 in}  ) to the engine coolant outlet of the radiator.
    Fig 3: Identifying Radiator Drain Plug And Hose
    G10951623Courtesy of MAZDA MOTORS CORP.
    NOTE:
    • If there is no specified hose, the coolant reserve tank hose can be used.
    Fig 4: Identifying Coolant Reserve Tank Hose
    G10951624Courtesy of MAZDA MOTORS CORP.
  6. Insert the hose into the service hole of the front under cover.
    Fig 5: Identifying Radiator Drain Plug, Hose And Service Hole
    G10951625Courtesy of MAZDA MOTORS CORP.
  7. Loosen the radiator drain plug and drain the engine coolant into a container.
  8. After completely draining the engine coolant, tighten the radiator drain plug.
  9. Disconnect the hose for draining engine coolant.
  10. Install the air cleaner case and resonance chamber No. 1 as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
  11. Install the air hose and air cleaner cover as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
  12. 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
  13. Refill the engine coolant from the water outlet filler neck until it is close to the top of the water outlet filler neck.
  14. Refill the engine coolant into the coolant reserve tank up to the FULL mark on the tank.
  15. Install the cooling system cap.
  16. Start the engine and warm up the engine by idling.
    CAUTION:
    • If the high engine coolant temperature warning light flashes, stop the engine to lower the engine coolant temperature and prevent overheating. Then, verify the malfunctioning part and repair or replace it.
  17. 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 2, 500 rpm  for 5 min  .
    2. Maintain the engine speed at 3, 000 rpm  for 5 s, and then idle  .
    3. Repeat Steps (1), (2) several times.
  18. Stop the engine and wait until the engine coolant temperature decreases.
  19. Inspect the engine coolant level.
    • If engine coolant level is low, repeat Steps  13 to  17.
  20. Inspect for engine coolant leakage. (See ENGINE COOLANT LEAKAGE INSPECTION .)
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