How to Replace Your VW’s Coolant Temperature Sensor

Whenever you see a warning light that comes on in your Volkswagen as a result of temperature issues, you should be watchful of your car’s coolant temperature sensor because it could be the problem. Failure to address this problem may result in expensive engine damage but replacing it is not usually as difficult as you think. Ready to learn how to fix this Volkswagen problem?

What Does CTS Mean?

The coolant temperature sensor, also known as the CTS, is a small unit that is found in your VW’s engine. Its main function is to monitor the temperature of the engine coolant and then relay this information to the computer of the car. This data is important because it is used to control the engine speed, fuel/air ratio, and even the cooling fans. If the sensor is not functioning properly, then it may result in overheating of the engine or low performance of your VW.

Signs Your Coolant Temperature Sensor Needs Replacement

• Warning Light: The first symptom of a bad coolant temperature sensor is when the warning light on your car dashboard turns on. This light could mean many things, but if the temperature or the performance of the engine is abnormal, then it could be the CTS.
• Poor Fuel Economy: If the sensor is providing wrong information about the temperature, the engine may consume more fuel and the fuel efficiency will drop. This occurs because the car’s computer may believe that the engine is cold and therefore supplies more fuel as in the case of a cold start.
• Engine Overheating: A defective sensor means that you have a problem with your cooling fan and your engine will overheat. Overheating is dangerous to your engine and this is why you should seek help as soon as you notice this problem.
• Erratic Temperature Gauge: It is also important to check the temperature gauge on your VW dashboard and if you find the gauge moving abnormally or showing erratic readings then it could be due to a damaged coolant temperature sensor.

How to Replace Your VW’s Coolant Temperature Sensor

• Safety First: Remember to always start off with a cool engine. This is because working on a hot engine may cause burns or any other related complications. One should also put on gloves and safety glasses to ensure that one does not come in contact with the coolant in case of any spills.
• Locate the CTS: The location of the Coolant Temperature Sensor may differ from one Volkswagen model to another. Most of the time it is placed near the thermostat housing or the engine block. Check the car’s user manual to know the location of the sensor more accurately.
• Drain the Coolant: Loosen the radiator drain plug and place a coolant catch pan beneath it to collect the coolant that is being drained. This step is important so that when you are removing the sensor, you do not find coolant gushing out. It is important to dispose off the old coolant in the right manner as per the law of the state.
• Remove Old Sensor: After the coolant has been removed, get a socket wrench to remove the bolt that is holding the sensor. Loosen the wiring harness connected to the sensor with extra precaution. You should be very careful so that you don’t end up causing damage to the connector or wires.
• Install New Sensor: Now take your new coolant temperature sensor and fit it into the place where the old one was pulled out. Bolt it and connect the wiring harness as it was before. Ensure that the sensor is well fixed and well connected so that there will be no leakage or wrong reading.
• Refill Coolant: Once a new sensor is fitted, shut the radiator drain plug and then add fresh coolant into the radiator. The coolant used should be the one that Volkswagen recommends for your particular car model.
• Test the Sensor: Start the engine and allow it to warm up for some time. Look around the sensor and the radiator and check for signs of leakage. Also, check the temperature gauge on your VW’s dashboard to verify if it is functioning well.

Come To The Volkswagen Experts In Algonquin

Welcome to France and Son, where we can take care of all of your Volkswagen maintenance and repair needs. If you do not know how to replace the coolant temperature sensor or you have any other issues in your VW, feel free to contact us. Our team of professional mechanics is always on standby to help you maintain your Volkswagen in the best way. We have our garage in Algonquin, IL and we are also happy to assist drivers from the nearby cities. Book your next VW inspection now!