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1. #Coolant temperature sensor how to#
2. #Coolant temperature sensor professional#
3. #Coolant temperature sensor free#

Make sure the connector is clean and free from debris, then carefully plug it into the new sensor, carefully tightening any clips to ensure a good connection with the terminal.

Once the new sensor is in place, the only thing left to do is reconnect the cable. Then, using a torque wrench, tighten the sensor to the amount specified in the manufacturer’s instructions. 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.

#Coolant temperature sensor how to#

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

#Coolant temperature sensor professional#

If in any doubt about which component is faulty beneath the bonnet, take your car to a professional mechanic for a complete diagnosis.

The CTS is usually found at the front of the car, near the thermostat housing, or on the radiator. Start by having a look at the unit itself to check its condition, as sensors/gaskets/connectors can develop cracks with extended use and continual temperature cycling. That’s why it’s important to know how to spot the signs of a faulty or failing temperature sensor, before it can cause further problems which could prove more expensive to fix. A faulty sensor can lead to a range of problems developing, including overheating and poor engine performance. Like any component under the bonnet, coolant temperature sensors can develop faults over time. How to Spot a Faulty Coolant Temperature Sensor This information is also used to send an accurate reading of the engine temperature to a gauge on the dashboard. The ECU uses this reading to calculate the coolant temperature, and from there adjusts the fuel injection, fuel mix, and ignition timing, and controls when the electric cooling fan is switched on and off. The resistance of the sensor varies with temperature, this is how the ECU can monitor temperature changes. To get an accurate reading of the current engine temperature, the ECU sends a regulated voltage to the CTS. The sensor works with the vehicle’s ECU, continually monitoring the coolant temperature to make sure the engine is running at the optimum temperature. What is a Coolant Temperature Sensor and How Does It Work?Ī coolant temperature sensor (CTS) (also known as an ECT sensor or ECTS (engine coolant temperature sensor) is used to measure the temperature of the coolant/antifreeze mix in the cooling system, giving an indication of how much heat the engine is giving off.