2000 Pontiac Grand Prix GT. Replaced coolant temperature sensor and now temp gauge is reading steady at above 260. How do I reset this?
Sounds like the new sensor is defective or the wiring going to it is damaged and touching something metal. If a bare spot on the wiring is touching something metal this can force the gauge to hot. Unplug the sensor and start the engine (ignore the service engine soon light). Does the gauge now read cold (160°)? If you didn't get a Delco sensor it may not work correctly. At NAPA, where I work, we have trouble with GMs and aftermarket coolant temperature sensors. HTH. -Jim
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