Engine Coolant Replacement

ENGINE COOLANT REPLACEMENT

Warning:
^ Never remove the pressure relief cap or coolant recovery reservoir cap while the engine is operating or when the cooling system is hot. Failure to follow these instructions can result in damage to the cooling system or engine or personal injury. To avoid having scalding hot coolant or steam blow out of the coolant reservoir when removing the pressure relief cap, wait until the engine has cooled, then wrap a thick cloth around the pressure relief cap and turn it slowly. Step back while the pressure is released from the cooling system. When you are sure all the pressure has been released, (still with a cloth) turn and remove the pressure relief cap. Failure to follow these instructions may result in personal injury.

Caution:
^ The coolant must be recovered in a suitable, clean container for reuse. If the coolant is contaminated it must be recycled or disposed of properly.

Caution:
^ Vehicle cooling systems are filled with Mazda Premium Gold Engine Coolant VC-7-A (in Oregon VC-7-B) (yellow color). Do not mix coolant types.

Note:
^ The addition of cooling system stop leak pellets, darkens engine coolant from yellow to golden tan. Do not add Mazda Specialty Orange Engine Coolant, VC-2. Mixing coolants may degrade the coolant's corrosion protection.

Note:
^ About 80% of the coolant capacity can be recovered with the engine in the vehicle. Dirty, rusty or contaminated coolant requires replacement.

Complete Drain
1. Remove the degas bottle cap.
2. Place a suitable container below the radiator draincock. Drain the coolant.
3. Place a suitable container below the radiator lower hose and disconnect the hose from the thermostat housing.

Filling and Bleeding

Caution:
^ Engine coolant provides freeze protection, boil protection, cooling efficiency and corrosion protection to the engine and cooling components. In order to obtain these protections, the engine coolant must be maintained at the correct concentration and fluid level. When adding engine coolant, use a 50/50 mixture of engine coolant and clean, drinkable water.
^ To maintain the integrity of the coolant and the cooling system:
^ Add Mazda Premium Gold Engine Coolant VC-7-A (in Oregon VC-7-B) or equivalent (yellow color). Use the same coolant that was drained from the system. Do not mix coolant types.
^ Do not add Mazda Specialty Orange Engine Coolant VC-2 or equivalent. Mixing coolants can degrade the coolant's corrosion protection.
^ Do not add alcohol, methanol, brine or any engine coolants mixed with alcohol or methanol antifreeze. These can cause engine damage from overheating or freezing.
^ Do not mix recycled coolant unless it meets the requirements of specification VC-7-A (in Oregon VC-7-B). Not all coolant recycling processes meet these specifications. Use of such coolant can harm the engine and cooling system components.

Note:
^ The addition of Mazda Cooling System Stop Leak Pellets, VC-6, darkens Mazda Premium Gold Engine Coolant from yellow to golden tan.

Filling and Bleeding Procedure For Use With Partial Drain
1. Ensure the radiator draincock is completely closed.
2. Fill the system through the degas bottle cap to 15 mm above the maximum fill level.
3. Install the degas bottle cap.

Warning:
^ Do not stand in line with or near the engine cooling fan blade when rowing the engine.

4. Start the engine and hold the engine speed at 2,500 rpm for approximately eight minutes until the thermostat opens.
5. Maintain the engine speed at 2,500 rpm for an additional three minutes.
6. Increase engine speed to 4,000 rpm and hold for five minutes.
7. Return the engine speed to 2,500 rpm and hold for an additional three minutes.
8. Stop the engine and check for leaks.

Filling and Bleeding Procedure For Use With Complete Drain
1. Install the radiator lower hose and close the radiator draincock.
2. Fill the system through the degas bottle cap to the maximum fill level.

Warning:
^ Do not stand in line with or near the engine cooling fan blade when rowing the engine.

3. Start the engine and run for approximately ten seconds at 2,500 rpm to prime the heater circuit then tom the engine off.
4. Top off the coolant level to 15 mm above the maximum fill level.
5. Install the degas bottle cap.
6. Start the engine and hold the engine speed at 2,500 rpm for approximately eight minutes until the thermostat opens.
7. Maintain the engine speed at 2,500 rpm for an additional three minutes.
8. Increase engine speed to 4,000 rpm and hold for five seconds.
9. Return the engine speed to 2,500 rpm and hold for an additional three minutes.
10. Repeat the previous two steps.
11. Stop the engine and check for leaks.
12. Verify the correct fluid level after the engine cools for 20 minutes. Top off the degas bottle to the maximum fill level.

Cleaning

Caution:
^ Always, remove the water thermostat prior to pressure flushing.

1. To remove the rust, sludge and other foreign material from the cooling system, use products that are safe for use with aluminum radiators.
2. Cleaning restores cooling efficiency and helps prevent overheating. A pulsating or reversed direction of flushing water will loosen sediment more quickly than a steady flow in the normal coolant flow direction.
3. In severe cases, cleaning solvents may not properly clean the cooling system for efficient operation. it will be necessary to use the pressure flushing method.
4. Dispose of old coolant and flushing water contaminated with antifreeze and cleaning chemicals in accordance with local, state and federal laws.