Kia Optima: Checking the coolant level - Engine coolant - Maintenance - Kia Optima TF 2011-2021 Owners ManualKia Optima: Checking the coolant level

WARNING

Removing radiator

Removing radiator cap

WARNING

The electric motor (cooling

The electric motor (cooling fan) is controlled by engine coolant temperature, refrigerant pressure and vehicle speed. It may sometimes operate even when the engine is not running. Use extreme caution when working near the blades of the cooling fan so that you are not injured by a rotating fan blades. As the engine coolant temperature decreases, the electric motor will automatically shut off. This is a normal condition. If your vehicle is equipped with GDI, the electric motor (cooling fan) may operate untill you disconnect the negative battery cable.

Check the condition and connections of

Check the condition and connections of all cooling system hoses and heater hoses. Replace any swollen or deteriorated hoses.

The coolant level should be filled between F (MAX) and L (MIN) marks on the side of the coolant reservoir when the engine is cool.

If the coolant level is low, add enough distilled (deionizer) water to provide protection against freezing and corrosion. Bring the level to F (MAX), but do not overfill. If frequent coolant addition is required, see an authorized Kia dealer for a cooling system inspection.

Recommended engine coolant

For mixture percentage, refer to the following table.

WARNING

WARNING

Radiator cap

Radiator cap

Do not remove the radiator cap when the engine and radiator are hot. Scalding hot coolant and steam may blow out under pressure causing serious injury.

Engine coolant
The high-pressure cooling system has a reservoir filled with year-round antifreeze coolant. The reservoir is filled at the factory. Check the antifreeze protection and coolant level at least on ...

Changing the coolant
Have the coolant changed by an authorized Kia dealer according to the Maintenance Schedule at the beginning of this section. CAUTION Put a thick cloth or fabric around the radiator cap befo ...

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