Cadillac 8993146 Sensor Assembly, Engine Wtr Temperature(1 Terminal)

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To test the Temperature Warning Light System, ensure the light turns on when the Ignition is on. If not, check the bulb. If the light remains on with a cold engine, disconnect the wire at the sending unit. If the light goes off, replace the unit. If it stays on, the wire is grounded in the harness. For the Temperature Gauge System, check the fuse if the gauge doesn't work. If the fuse is fine, disconnect the wire from the sending unit and ground it. Turn on the ignition; if the gauge registers at maximum, replace the unit. If not, the gauge or wiring may be faulty. To replace the sending unit, cool the engine, remove the cover, disconnect the wire, and unscrew the unit. Install the new unit, connect the wire, and replace the cover.

The coolant temperature switch or sender is located at the left rear of the cylinder head on L4 engines.

As soon as the engine starts, the lamp should go out and remain off unless the engine overheats.

The Engine Coolant Temperature (ECT) sensor is a thermistor, a resistor that changes its resistance value based on temperature changes.

In the event of an unusual indication or a fault developing, one should first check the coolant level in the system. Then, ensure that the connecting wiring between the gauge and the sender unit is secure.

As the sensor temperature increases, the resistance values decrease, and vice versa. This change in resistance directly affects the voltage signal from the sensor to the ECM/PCM.

If the lamp does not go out after the engine starts, it could be due to the wiring being grounded between the lamp and the sender unit, a defective temperature sender unit, or a faulty ignition switch.

When the ignition switch is turned on and the starter motor is turning, the indicator light should be on, indicating an overheated engine.

When the ignition switch is turned on and the starter motor is turning, the indicator lamp should be illuminated, indicating an overheated engine.

If there is an unusual indication or a fault in the indicator system, it is necessary to check the coolant level in the system and ensure that the connecting wiring between the gauge and the sender unit is secure.