Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2007 Mazda 6 L4-2.3LFACTORY OEM SERVICE PROCEDURE
Procedures
ENGINE COOLANT REPLACEMENT
Warning
^ Drain the engine coolant when the engine is cold, otherwise it may burn you and cause serious injury.

1. Remove the cooling system cap and the radiator drain plug.
2. Drain the 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.
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 reduce the coolant's effectiveness.
^ Engine coolant damages paint. If engine coolant does get on a painted surface, rinse it off quickly.
6. Select proper volume percentage of the water and coolant.

Antifreeze solution mixture percentage
7. Slowly pour the coolant into the radiator up to the coolant filler port. (2.3L engine model)
8. Fill the engine coolant into the coolant reservoir tank up to the F mark on the coolant reservoir tank.
9. Tighten the cooling system cap.
Caution
^ If the coolant temperature becomes too high, stop the engine to prevent it from overheating.
10. Start the engine and idle it until the cooling fan operates.
11. After engine warms up, perform the following steps.
1) Run the engine at 2,500 rpm for 5 minutes
2) Run the engine at 3,000 rpm for 5 seconds then idle.
3) Repeat steps (2) several times.
4) Idle the engine for 1 minutes.
12. Stop the engine and wait until it is cool.
13. Inspect the coolant level.
^ If it is low, repeat Steps 7-12 (2.3L engine model), Steps 8-12 (3.0L engine model).
14. Install the cooling system cap.
15. Inspect for coolant leakage.
Warning
^ Drain the engine coolant when the engine is cold, otherwise it may burn you and cause serious injury.
L3 = 2.3L / AJ = 3.0L:
1. Remove the cooling system cap and the radiator drain plug.
2. Drain the 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.
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 reduce the coolant's effectiveness.
^ Engine coolant damages paint. If engine coolant does get on a painted surface, rinse it off quickly.
6. Select proper volume percentage of the water and coolant.
Antifreeze solution mixture percentage
7. Slowly pour the coolant into the radiator up to the coolant filler port. (2.3L engine model)
8. Fill the engine coolant into the coolant reservoir tank up to the F mark on the coolant reservoir tank.
9. Tighten the cooling system cap.
Caution
^ If the coolant temperature becomes too high, stop the engine to prevent it from overheating.
10. Start the engine and idle it until the cooling fan operates.
11. After engine warms up, perform the following steps.
1) Run the engine at 2,500 rpm for 5 minutes
2) Run the engine at 3,000 rpm for 5 seconds then idle.
3) Repeat steps (2) several times.
4) Idle the engine for 1 minutes.
12. Stop the engine and wait until it is cool.
13. Inspect the coolant level.
^ If it is low, repeat Steps 7-12 (2.3L engine model), Steps 8-12 (3.0L engine model).
14. Install the cooling system cap.
15. Inspect for coolant leakage.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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