On the SL2 (DOHC), there are two coolant temperature sensors located on the left-hand side of the cylinder head, near the upper coolant hose.
Your SL1 (SOHC) might be different.
On the SL2, the upper sensor with ONE WIRE controls the temperature gauge in the dash. The lower sensor with TWO wires provides input to the computer. They are not interchangeable. Yours may be similar.
Here is a tip you will need a 4mm deepwell socket to get it out.
Actually, you will need a 14mm deep socket or box wrench. The new sensor may require a 13mm socket or wrench, depending on the manufacturer.
Replace the engine coolant temperature sensor. Your car has two, replace the one with the 2 wire connector
Replace your Engine Coolant Temperature Sensor. Your car has two, replace the one with the two wire connector
Engine coolant temperature switch/sensor
The coolant temperature sensor can be found on the front of the engine, near the thermostat. Remove the coolant temperature sensor retaining nut, to replace it.
Replace your Engine Coolant Temperature Sensor. Visit Saturnfans.com for help in diagnosis
Engine Coolant Temperature Sensor.
on the right side of the engine
Start by replacing the Engine Coolant Temperature Sensor
probably just replace the coolant sensor
If it is noisy, leaking or not pumping sufficient coolant to cool the engine, replace it.
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The engine coolant temperature sensor is usually on the front of the engine. The coolant temperature sensor will be in the vicinity of the thermostat housing.