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Here’s a detailed guide with bullet points for clarity:

### Tools and Materials Needed
– **Coolant Flush Kit**: This typically includes a flush chemical designed to clean the cooling system.
– **New Coolant**: Ensure you use the appropriate type for the RX-7; typically, a 50/50 mix of distilled water and ethylene glycol-based coolant is recommended.
– **Wrenches and Sockets**: To remove hoses and drain plugs.
– **Drain Pan**: To catch old coolant as it drains out.
– **Funnel**: For adding new coolant.
– **Garden Hose**: For rinsing the cooling system (if applicable).
– **Safety Gloves and Goggles**: To protect yourself from coolant and chemicals.
– **Rags or Shop Towels**: For cleaning up spills.

### Preparation
– **Park the Vehicle**: Ensure the RX-7 is on a level surface and turn off the engine. Allow it to cool down completely before starting the flush.
– **Safety First**: Wear gloves and goggles to protect yourself from any spills or splashes.

### Draining the Old Coolant
– **Locate the Drain Plug**: Find the radiator drain plug at the bottom of the radiator.
– **Position the Drain Pan**: Place the drain pan under the radiator to catch the old coolant.
– **Open the Drain Plug**: Carefully remove the drain plug using the appropriate wrench or socket. Allow the old coolant to drain completely into the pan.
– **Remove the Upper Radiator Hose**: If necessary, loosen the clamp on the upper radiator hose and remove it for better access to the cooling system.

### Flushing the Cooling System
– **Add Flush Chemical**: If using a coolant flush chemical, follow the instructions on the product. Typically, you will add it to the radiator or overflow tank.
– **Fill with Water**: After adding the flush chemical, fill the system with water (using distilled water is best). Reinstall the drain plug (if removed) and run the engine for about 10-15 minutes to circulate the solution.
– **Turn Off the Engine**: Allow the engine to cool down again before draining the system.

### Rinsing the System
– **Drain the Flush Solution**: Open the drain plug again and let the flushing solution drain completely.
– **Rinse with Water**: If using a garden hose, insert it into the radiator fill neck and let water run through the system until it drains clear. This can take several minutes.
– **Check for Contaminants**: Ensure no debris or old coolant is left in the system. Repeat rinsing if necessary.

### Adding New Coolant
– **Close the Drain Plug**: Once rinsed, reinstall the drain plug securely.
– **Add New Coolant**: Using a funnel, pour the new coolant into the radiator. Fill it to the specified level, usually just below the cap.
– **Bleed the Cooling System**: To remove air pockets, run the engine with the radiator cap off until the thermostat opens and coolant starts circulating. This may take a few minutes. Keep an eye on the coolant level and top off as needed.

### Final Steps
– **Check for Leaks**: Inspect around the drain plug and hoses for any leaks after the flush and refill.
– **Dispose of Old Coolant Properly**: Take the old coolant to a recycling center or a local auto parts store that accepts hazardous waste.
– **Test Drive**: After everything is reassembled, take the RX-7 for a short test drive to ensure the cooling system is functioning properly. Monitor the temperature gauge during the drive.

### Post-Flush Checks
– **Monitor Coolant Levels**: After a few days of driving, check the coolant level again and top off if necessary.
– **Inspect for Issues**: Look for any signs of leaks or overheating to ensure the system is operating correctly.

Following these steps will help you effectively flush the coolant system on your Mazda RX-7, ensuring it runs efficiently and prolongs the life of the engine. Always refer to the vehicle’s manual for specific instructions or precautions related to your model year.
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