![]() Set the new sensor in the threads and twist clockwise by hand, making sure the sensor is well-seated in the socket. Using a rag or cloth, clean the area of dust and debris which may impact on the performance of the new CTS. Coolant is likely to leak out at this point, so have the new one ready to replace it, or consider draining the coolant if required. Once the sensor is loose, unscrew by hand and remove it from the socket. A squirt of release spray can help free up stuck sensors. Using a deep socket and ratchet, carefully loosen the sensor in an anticlockwise direction, without applying too much pressure. ![]() Step 3: Loosen and Remove the Old SensorĬoolant sensors are fitted like a spark plug, so you need to unscrew it to remove it. Disconnect the connector, and set the cable aside so it’s out the way. Do this carefully, as the plastic connector and wiring can often be brittle and will need completely replacing if it breaks. The CTS is connected to the ECU by a connector, which you’ll need to unfasten and remove. ![]() Step 2: Remove the Connector Cable from the Terminal Removing the engine cover can also help you find it if it’s located near the thermostat housing. Because it’s a small component and is often located lower down inside the engine bay, you may need to use a light or torch to find it. The CTS is normally towards the front of the engine, near the radiator or thermostat housing. The steps below demonstrate how to change a faulty coolant temperature sensor in your car. Replacing a coolant temperature sensor is a simple process for anyone who is familiar with the components of an engine, and can be done right on your drive. How to Replace a Coolant Temperature Sensor If in any doubt about which component is faulty beneath the bonnet, take your car to a professional mechanic for a complete diagnosis.
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