Inspecting the Coolant
Do not use a match or live flame in the engine compartment. DO NOT ADD COOLANT WHEN THE HYBRID SYSTEM IS HOT.
A hot hybrid system is dangerous. If the hybrid system has been running, parts of the engine compartment can become very hot. You could be burned. Carefully inspect the engine coolant in the coolant reservoir, but do not open it.
Do not touch rotating parts such as the fan or belt when inspecting inside the engine compartment.
Working near the cooling fan when it is running is dangerous. The fan could continue running indefinitely even if the hybrid system has stopped and the engine compartment temperature is high. You could be hit by the fan and seriously injured.
Do not remove either cooling system cap when the hybrid system and radiator are hot.
When the hybrid system and radiator are hot, scalding coolant and steam may shoot out under pressure and cause serious injury.
Inspect the antifreeze protection and coolant level in the coolant reservoir at least once a year―at the beginning of the winter season―and before traveling where temperatures may drop below freezing.
Inspect the condition and connections of all cooling system and heater hoses.
Replace any that are swollen or deteriorated.
There are two cooling circuits: one for the power control unit, and the other for the engine. Check both circuits.
The coolant should be at full in the radiator and between the F and L marks, and between the FULL and LOW marks on the coolant reservoir when the hybrid system is cool.
There are two coolant reservoir tanks. Check each of them.
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Tank for the power control unit
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Tank for the engine
If it is at or near the L or LOW position, add enough coolant to the coolant reservoir to provide freezing and corrosion protection and to bring the level to F or FULL.
Securely tighten the coolant reservoir tank cap after adding coolant.
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Radiator coolant will damage paint. Rinse it off quickly if spilled.
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If the “FL22” mark is shown on or near the cooling system cap, use of FL-22 is recommended when replacing engine coolant. Using engine coolant other than FL-22 may cause serious damage to the hybrid system and cooling system.
If the coolant reservoir is empty or new coolant is required frequently, consult an Authorized Mazda Dealer.
