Kia Optima: Safety Belt Warning Light and ChimeAs a reminder to the driver and passenger, safety belt warning light will blink for approximately 6 seconds each time you turn the ignition switch ON.
If the driver's lap/shoulder belt is not fastened when the key is turned ON or if it is unfastened after the key is turned ON, the safety belt warning light blinks for approximately 6 seconds and safety belt warning chime sounds for approximately 6 seconds.

Safety Belt Restraint SystemRemoval and Installation
Disassembly of the thermostat would have an adverse effect, causing a lowering
of cooling efficiency. Do not remove the thermostat, e ...
Removal
1.
Turn the ignition switch OFF and disconnect the battery
negative (-) cable.
2.
Disconnect the purge control solenoid valve connector
(A).
3. ...
Removal
1.
Disconnect the vapor hose (A).
2.
Remove the PCV valve (B).
...