Kia Sportage: Checking the coolant level
WARNING - Removing radiator cap

Never attempt to remove the radiator cap while the engine is operating or hot. Doing so might lead to cooling system and engine damage.
Also, hot coolant or steam could cause serious personal injury.
Turn the engine off and wait until it cools down. Use extreme care when removing the radiator cap. Wrap a thick towel around it, and turn it counterclockwise slowly to the first stop. Step back while the pressure is released from the cooling system. When you are sure all the pressure has been released, press down on the cap, using a thick towel, and continue turning counterclockwise to remove it.
WARNING - Cooling fan

Use caution when working near the blade of the cooling fan. 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.

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 and L marks on the side of the coolant reservoir when the engine is cool.
If the coolant level is low, add enough distilled (deionized) water to provide protection against freezing and corrosion. Bring the level to F, but do not overfill. If frequent additions are required, see an authorized Kia dealer for a cooling system inspection.
Recommended engine coolant
For mixture percentage, refer to the following table.

Engine coolant
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CVVT Oil Temperature Sensor (OTS): Specifications
Specification
Temperature [°C(°F)]Resistance (k?)-40(-40)52.15-20(-4)16.520(32)6.020(68)2.4540(104)1.1160(140)0.5480(176)0.29
...