Kia Optima: Intake Air Temperature Sensor (IATS). Description and OperationTo calculate precise air quantity, correction of the air temperature is needed because air density varies according to the temperature. So the ECM uses not only MAPS signal but also IATS signal. This sensor has a Negative Temperature Coefficient (NTC) Thermister and it's resistance changes in reverse proportion to the temperature.

Installation
Intake Air Temperature Sensor (IATS). SpecificationsInstallation
•
Install the component with the specified
torques.
•
Note that internal d ...
Automatic Heating and Cooling Control System
Your vehicle is equipped with an automatic heating and cooling control system
controlled by simply setting the desired temperature. ...
Intake Manifold. Repair procedures
Removal and Installation
1.
Remove the engine cover.
2.
Disconnect the battery negative
terminal (A).
Tightening torque4.0 ~
6.0N.m (0.4 ~ 0.6kgf.m, 3. ...