What does the fan switch do? How can you detect fan switch failure? What does a fan turn do ?….
What is the duty of the fan switch?
A fan switch is a simple, small switch with two wires that is typically mounted behind the radiator. This switch will react to engine temperature. It activates a relay which supplies voltage to fan so that fan can start when engine temperature rises above a threshold. The radiator fan continues running until the engine temperature falls to the set level. The relay is turned off when the engine reaches the normal temperature. This turns off the fan and stops it. Although it is simple in design, the fan switch plays an essential role in the cooling system.
Two cooling fans may be required for large radiators. The radiator fan is only used to cool the engine. An engine that is just started does not require additional cooling. The fan won’t turn on until the engine is at its normal operating temperature (195-215 degrees). The fan will then switch on and off depending on the engine temperature. The radiator fan is usually on when the vehicle is idle or at low speeds. Some vehicle models have the fan running slowly. To speed up cooling, the fan’s rotation speed can be adjusted gradually.
The main reason electric fans are used instead of mechanical fans driven by belts is to reduce noise and fuel consumption. A fan driven by a belt can use 12 to 15 horsepower depending on the vehicle’s speed and cooling load.
The ECU and sensors control the fan in computer-controlled vehicles. The ECU uses data from sensors such as the ambient air temperature sensor, engine coolant sensor and other sensors to determine when the fan should be switched on.
How to identify fan switch failure
Listening to the engine as you drive is the best way to find a defective fan switch. The problem could be in the fan switch if you hear the fan noise less often than before. This is especially true if you live in traffic jams and are not able to hear it. Two wires connect to the sensor as mentioned earlier. A short circuit can occur if one of the wires is damaged. The fan may then run intermittently. The fan might not turn on when it should or run unexpectedly.
A rising temperature in the instrument panel can also be a sign of engine water being too hot. Motors produce huge heat and are therefore subject to large temperature fluctuations. The fan switch may not be working well. Temperatures above a certain point can lead to engine failure and other problems. You should check the fan switch if the temperature indicator goes up while driving.
After driving, you may also hear the fan running. It’s normal, but the fan should stop after a few minutes.
When the vehicle is moving at 50 km/h, there is no need to use a fan. Because air flows through the front grille, it cools the engine.
Fan Switch Control
First, check that the fan is running. The socket should be checked if there is no problem with the electricity supply. The socket is connected to electricity and the fan will work if it does. If the socket doesn’t work, the fan will normally turn on. However, if it does, the fan switch may be defective. This is a problem that can be caused by electricity so it’s best to have a specialist look at it.
