Engine Cooling Description And Operation

ENGINE COOLING DESCRIPTION AND OPERATION

CAUTION:Early build vehicle cooling systems are filled with Mazda Premium Gold Engine Coolant. Late build vehicle cooling systems are filled with Mazda Specialty Orange Engine Coolant. Do not mix coolant types. Mixing coolant types degrades the corrosion protection of the coolant. Failure to follow these instructions may damage the engine or cooling system.
NOTE:The addition of Cooling System Stop Leak Pellets darken coolant from yellow to golden tan.
The cooling system consists of the following components:

- Block heater (if equipped)
- Radiator
- Bypass tube
- Pressure relief cap
- Degas bottle
- Radiator draincock
- Coolant pump
- Coolant temperature indicator sender unit
- Thermostat housing

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 in the degas bottle.
When adding engine coolant, use a 50/50 mixture of engine coolant and distilled water.To maintain the integrity of the coolant and the cooling system:

CAUTION:Early build vehicle cooling systems are filled with Mazda Premium Gold Engine Coolant. Late build vehicle cooling systems are filled with Mazda Specialty Orange Engine Coolant. Do not mix coolant types. Mixing coolant types degrades the corrosion protection of the coolant. Failure to follow these instructions may damage the engine or cooling system.
NOTE:The addition of Cooling System Stop Leak Pellets darkens Mazda Premium Gold Engine Coolant from yellow to golden tan.
Add Mazda Premium Gold Engine Coolant or equivalent meeting Mazda Specifications (yellow color). Do not mix coolant types.

- Do not add/mix orange-colored Mazda Specialty Orange Engine Coolant or equivalent meeting Mazda specifications or green colored Mazda Premium Engine Coolant meeting Mazda specifications or equivalent. Mixing coolants may 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.
- Mazda Corporation does NOT recommend the use of recycled engine coolant in vehicles.

NOTE:Black arrows indicate hot, white arrows indicate cold.
Coolant Flow Diagram - 2.5L










Coolant Flow Diagram - 3.0L