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
Disconnect battery ground cable and electrical connector from sensor. Connect an ohmmeter between sensor terminals. Reading should be as shown in Temperature/Resistance Relationship chart. Disconnect ohmmeter and check resistance between each terminal and sensor body. A very high resistance denoting an open circuit should be obtained. If sensor does not respond as outlined, replace coolant temperature sensor.
| Temperature (Coolant) | Resistance (Ohms) |
|---|---|
| 14°F (-10°C) | 9200 |
| 32°F (0°C) | 5900 |
| 68°F (20°C) | 2500 |
| 104°F (40°C) | 1180 |
| 140°F (60°C) | 600 |
| 176°F (80°C) | 325 |
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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.