Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2002 Kia Optima L4-2.4LFACTORY OEM SERVICE PROCEDURE
Multi-Function Thermal Sensor / Switch: Testing and Inspection
Thermostatic Switch
1. Remove the glove box assembly.
2. Turn the blower and A/C switches ON.
3. Start the engine.
4. With the thermostatic switch connector in coupled state, install a voltmeter between 2 and 3 (-) terminal and check whether there is change in voltage between terminals according to the temperature of the evaporator surface.
* Thermostatic switch operating characteristics
NOTE: This check should be carried out on the back probes of the thermostatic switch when it is in coupled state.
5. If above condition is not satisfied, remove the evaporator unit and replace the thermostatic switch.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.