How to Change an Engine Coolant Temperature Sensor in a Chevrolet Cavalier
The engine coolant temperature sensor (also known as the coolant temperature sending unit) is a small sensor screwed into the thermostat hou...
The engine coolant temperature sensor (also known as the coolant temperature sending unit) is a small sensor screwed into the thermostat housing. The sensor measures the temperature of the coolant and relays that information to the temperature gauge on the dash. It is also responsible for illuminating the warning light if the coolant reaches a temperature where the engine could be damaged. If the temperature gauge in the dash of your Chevrolet Cavalier no longer works, you may have to replace this sensor.
Instructions
Draining the Cooling System
- 1
Disconnect the ground cable from the negative battery terminal. Loosen the retaining bolt using a wrench, then pull the clamp off the terminal.
2Locate the petcock valve on the right side of the radiator, and place a waste oil collection pan underneath it.
3Open the valve by turning it counterclockwise with needlenose pliers.
4Close the valve by turning it clockwise (after all the coolant has drained out) using needlenose pliers.
Removing the Temperature Sensor
- 5
Locate the thermostat housing. It will be located between the upper radiator hose and the engine.
6Detach the electrical connector from the coolant temperature sending unit by pulling it off. The sending unit will be screwed into the thermostat housing.
7Unscrew the sending unit from the thermostat using a wrench.
Installing the Temperature Sensor
- 8
Coat the threads of the new coolant temperature sending unit with a thin coat of RTV silicone sealant.
9Screw the sending unit into the thermostat. Tighten with a wrench.
10Fill the radiator with a 50/50 mix of antifreeze and water.
11Reconnect the ground cable to the negative battery terminal. Slide the clamp over the terminal. Tighten the retaining bolt using a wrench.
12Run the engine and visually inspect for leaks.