The temperature sensor on a 1987 Cutlass Ciera Brougham is used by the powertrain control module, or PCM, to monitor the temperature of the engine coolant in real-time. The PCM uses this data to determine when to power on the cooling fan. The PCM also uses data from the temperature sensor to calculate engine load and regulate the ignition timing. When this sensor fails, the car may overheat in traffic or show sluggishness during acceleration.
Tools Used: Battery terminal wrench, Metric box-end wrench set, Thread-seal tape, Replacement temperature sensor
Install Temperature Sensor
Turn off the engine and place the gear selector in park. Apply the emergency brake and open the hood. Disconnect the negative battery terminal using the battery terminal wrench.
Find the coolant temperature sensor. It's located on the intake manifold housing near the top-right side of the engine.
Unplug the sensor's electrical connector. Use a box-end wrench to remove the sensor.
Wrap the threads on the new sensor with thread-seal tape. Install the new sensor using a box-end wrench.
Reconnect the sensor's electrical connector. Wipe up any spilled coolant, and reconnect the negative battery terminal with the battery terminal wrench.
Start the engine, check for coolant leaks and verify that the engine is operating properly.
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