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.
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
1991 Hyundai Sonata V6-3.0LSECTION Testing and Inspection
Coolant Temperature Sensor Location:
To test the Coolant Temperature Sensor, located in the intake manifold, proceed as follows.
Coolant Temperature Sensor:
1. Remove the Coolant Temperature Sensor from the intake manifold.
Coolant Temperature Sensor Test:
2. With the sensing portion of the Coolant Temperature Sensor immersed in hot water, check resistance between the two terminals. The sensor should be held with its threaded housing 3 mm (1/8in.) away from the surface of the hot water.
Standard Values
Water Sensor
Temperature (°F) Resistance (Kohm)
32.....................5.9
68.....................2.5
104.....................1.1
176.....................0.3
3. If the resistance deviates from the standard value, replace the sensor.
Coolant Temperature Sensor Connector Test:
NOTE: If the temperature of the engine coolant is known, then the sensor may be tested at the connector.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.