How to Change an Engine Coolant Temperature Sensor in a Chevrolet Cavalier

by Jeffrey Caldwell

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.

Draining the Cooling System

Disconnect the ground cable from the negative battery terminal. Loosen the retaining bolt using a wrench, then pull the clamp off the terminal.

Locate the petcock valve on the right side of the radiator, and place a waste oil collection pan underneath it.

Open the valve by turning it counterclockwise with needlenose pliers.

Close the valve by turning it clockwise (after all the coolant has drained out) using needlenose pliers.

Removing the Temperature Sensor

Locate the thermostat housing. It will be located between the upper radiator hose and the engine.

Detach the electrical connector from the coolant temperature sending unit by pulling it off. The sending unit will be screwed into the thermostat housing.

Unscrew the sending unit from the thermostat using a wrench.

Installing the Temperature Sensor

Coat the threads of the new coolant temperature sending unit with a thin coat of RTV silicone sealant.

Screw the sending unit into the thermostat. Tighten with a wrench.

Fill the radiator with a 50/50 mix of antifreeze and water.

Reconnect the ground cable to the negative battery terminal. Slide the clamp over the terminal. Tighten the retaining bolt using a wrench.

Run the engine and visually inspect for leaks.

Tip

  • check If your engine coolant is still clean, meaning it is mostly transparent and has no signs of rust, you can get away with only draining about half a gallon of coolant from the radiator.

Warning

  • close The scent of antifreeze is highly attractive to household pets. It is also highly toxic. Keep small children and pets away from antifreeze.

Items you will need

References

About the Author

Jeffrey Caldwell has been a freelance writer for over five months and has published over 250 articles on websites like eHow and Trails.com. Caldwell writes articles on a wide range of topics including travel, camping and automotive mechanics. He has a Bachelor of Arts in English from Millersville University.