temperature gauge light turns on while driving

Hi,

Chances are either there is a connection issue or the sensor is going bad. The engine coolant temperature sensor is located at the rear of the cylinder head. See pictures 1 and 2. Check to make sure the connections is tight. If it is, here are the directions for testing.

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2010 Kia Forte L4-2.0L
Component Tests and General Diagnostics
Vehicle Sensors and Switches Sensors and Switches - Cooling System Engine - Coolant Temperature Sensor/Switch Temperature Sensor (Gauge) Testing and Inspection Component Tests and General Diagnostics
COMPONENT TESTS AND GENERAL DIAGNOSTICS
Inspection

Engine Coolant Temperature Sender
1. Using an ohmmeter, measure the resistance between the terminal 2 and ground.


pic 3

2. If the resistance value is not as shown in the table, replace the temperature sender.


pic 4

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Here are a couple links you may find helpful for testing:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find or if you have other questions.

Take care,
Joe