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
Coolant temperature sensor is located in cylinder head coolant outlet next to thermo-time switch. Remove connector from sensor and measure resistance across terminals. Resistance value depends upon coolant temperature. See COOLANT TEMPERATURE SENSOR RESISTANCE table. If values are not as specified, replace sensor.
| Test Temperature: °F (°C) | Resistance: Ohms | |||||
|---|---|---|---|---|---|---|
| 325 (1) | ||||||
| 14 +/- 2° (-10 +/- 1°) | 7000-11600 | |||||
| 68 +/- 2° (20 +/- 1°) | 2100-2900 | |||||
| 178 +/- 2° (80 +/- 1°) | 270-400 | |||||
| 325i (2) | ||||||
| 14 +/- 2° (-10 +/- 1°) | 8200-10500 | |||||
| 68 +/- 2° (20 +/- 1°) | 2200-2700 | |||||
| 178 +/- 2° (80 +/- 1°) | 300-360 | |||||
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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.
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