Engine Coolant Replacement

Drain the coolant in the coolant reservoir.
Remove the radiator cap and the radiator drain plug. (See COOLING SYSTEM SERVICE WARNINGS .)
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.
Tightening torque
1. 0.7-1.1 N.m (7-10 in.lbf)
Fig 1: Identifying Radiator Drain Plug
Courtesy of MAZDA MOTORS CORP.
CAUTION:
- The engine has aluminum parts than 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 the coolant effectiveness.
- Engine coolant will damage paint. If engine coolant does get on a painted surface, rinse it off quickly.
Referring to the following graph and chart, select proper gravity of the coolant.
Antifreeze solution mixture percentage

Fig 2: Antifreeze Solution Mixture Percentage Chart
Courtesy of MAZDA MOTORS CORP.
Slowly pour the coolant into the radiator up to the coolant filler port.
Filling pace
1. 1.0 L (1.1 US qt)/min [max]
Fill the coolant into the reservoir up to the FULL mark on the coolant reservoir.
Fully install the radiator cap.
Start the engine and warm it up.

Fig 3: Specific Gravity Graph
Courtesy of MAZDA MOTORS CORP.
CAUTION:
- If the coolant temperature becomes too high, stop the engine to prevent it from overheating.
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 Min.
3. Repeat steps (1) and (2) 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 coolant leakage.