Kia Optima: Change to "winter weight" oil if necessary

Check battery and cables

Winter puts additional burdens on the battery system. Visually inspect the battery and cables as described in section 7. The level of charge in your battery can be checked by an authorized Kia ...

Check spark plugs and ignition system

Inspect your spark plugs as described in section 7 and replace them if necessary. Also check all ignition wiring and components to be sure they are not cracked, worn or damaged in any way. ...

See also:

Compressor. Components and Components Location
Components 1. Screw 2. Bolt 3. Disc & Hub Assembly 4. Retainer Ring 5. Pulley 6. Connector Bracket 7. Screw 8. Compressor Assembly ...

Power Window Motor. Schematic Diagrams
Circuit Diagram ...

General Information
General Troubleshooting Information Before Troubleshooting 1. Check applicable fuses in the appropriate fuse/relay box. 2. Check the battery for damage, state of char ...