Mazda 2003 B2300 Owner's Manual page 205

2.3L engine
3.0L & 4.0L engines
When the engine is cold, check the level of the engine coolant in the
reservoir.
The engine coolant should be at the "cold fill level" or within the "cold
fill range" as listed on the engine coolant reservoir (depending upon
application).
Refer to the service maintenance section for service interval
schedules.
Confirm the color and type of engine coolant before adding, to avoid
mixing uncompatible products.
Be sure to read and understand Precautions when servicing your
vehicle in this chapter.
If the engine coolant has not been checked at the recommended interval,
the engine coolant reservoir may become low or empty. If the reservoir is
low or empty, add engine coolant to the reservoir. Refer to Adding
engine coolant in this chapter.
Maintenance and Specifications
205