Engine Coolant Replacement

Drain the coolant in the coolant reservoir.
Remove the radiator cap and loosen the radiator drain plug.

Fig 1: Removing Radiator Cap And Loosen Radiator Drain Plug
Courtesy of MAZDA MOTORS CORP.
Drain the coolant into a container.
Flush the cooling system with water until all traces of color are gone.
Let the system drain completely.
Tighten the radiator drain plug.
CAUTION:
- The engine has aluminum 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 cut down on the coolant's effectiveness.
- Engine coolant will damage paint. Rinse it off quickly.
Referring to the following chart, select proper volume percentage of the water and coolant. Slowly pour the coolant into the radiator up to the coolant filler port.
Filling pace

1.0 L {1.1 US qt, 0.9 Imp qt}/min. [max]

Antifreeze solution mixture percentage

Fig 2: Antifreeze Solution Mixture Percentage Table
Courtesy of MAZDA MOTORS CORP.
Pour coolant into the reservoir up to the FULL mark on the coolant reservoir.
Fully install the radiator cap.
CAUTION:
- If the coolant temperature becomes too high, stop the engine to prevent it from overheating.
Start the engine and let it idle for approx. 10 min.
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. Repeat this several times.
Stop the engine and wait until it is cool.
Inspect the coolant level. If it is low, repeat Steps 7-12.
Verify there is no leakage.