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The coolant temperature sensor, also known as the coolant temperature switch, is a temperature measuring component which measures engine coolant temperature and sends this reading to the engine control module (ECM). The engine coolant temperature reading plays a very important role in air and fuel mixture ratio. This reading also plays a role to turn on the engine cooling fan at a certain temperature.
The coolant temperature sensor is a critical part of the cooling system. If defective, it can cause serious internal engine damage from overheating, incorrect air-fuel ratio, or incorrect ignition timing. It can also shorten the life of the cooling fan motor or other electrical components of the cooling system.
Faulty coolant temperature sensor can cause the fan to run occasionally or it does not work at all, which in turn causes overheating or overuse of the cooling fan motor.
The engine's air-fuel ratio keeps it running smoothly. If the ratio is not correct, the engine will have low fuel consumption and will run poorly or not at all. The coolant temperature sensor is important because it provides the ECU with the information it needs to perform this calculation and run the engine optimally. If you suspect your coolant temperature sensor is faulty, ask one of our authorized technicians to diagnose the problem immediately.
Coolant temperature sensor replacement depends on the make and model of the vehicle. A typical mid-priced brand like Ford, Fiat, Honda, vauxhall or hyundai can cost between £ 75 and £ 155 at an authorized dealer.