Where is the Temperature Control Switch for the Car Electric Fan?
3 Answers
Car electric fan temperature control switch locations are divided into two scenarios: older models and newer models. In older models, the temperature control switch is mostly on the radiator, typically with three wires controlling the high and low-speed fans. Nowadays, most cars use computer-controlled fans, with the water temperature sensor installed near the thermostat. Below is an introduction to how car fans work: The high and low speeds of the car fan are "uniquely" controlled by the thermal switch (F18), which sends two-stage signals to J293. J293 then activates different open circuits to control the high and low speeds of the electric fan. When the air conditioning is turned on, both fans should operate. However, it should be noted that the air conditioning and the electric fan are two relatively independent systems, controlled by two separate computers named J301 (air conditioning) and J293 (electric fan).
With over a decade of car repair experience, I can confirm that the thermostat switch is typically installed near the radiator, most commonly on the upper part of the radiator or the coolant outlet pipe. It's a small sensor that detects water temperature to control the fan's operation, preventing engine overheating. Different car models have variations: for example, Japanese cars often place it at the top of the radiator, while German cars might position it beside the pipe connection. When locating it, open the hood and trace the fan's wiring back to find it. Remember to regularly check for aging wires or rusty contacts—if it fails and the fan stops working, high temperatures could damage engine components, significantly increasing repair costs. When replacing the switch yourself, always disconnect the battery's negative terminal to ensure safe operation.
Last time my car's fan had an issue, and after a lot of troubleshooting, I found out it was a faulty temperature control switch. It's usually located near the radiator, close to the water pump or radiator hose connection points. When I inspected it myself, I first took photos of the radiator area with my phone to check for any plug-in devices with wires. The location varies significantly by brand, but in sedans, it's often in the central front area of the engine. If the switch fails, the fan won't activate, making the car prone to overheating and breaking down on the road. It's recommended to first test the voltage to see if it's normal. Cleaning the engine bay once a year can extend the switch's lifespan and prevent frequent malfunctions.
