What Are the Reasons for a Car Radiator Fan Not Spinning?
2 Answers
Here are the reasons why a car radiator fan may not spin: 1. Whether the coolant temperature meets the requirement: Most modern car radiator fans operate electronically based on temperature control. Therefore, the fan typically starts spinning only when the coolant temperature inside the car reaches the required level. If the temperature is too low, the radiator fan will not spin. Thus, if the car radiator fan fails to spin, the first thing to check is whether the coolant temperature meets the requirement. 2. Relay failure: If the coolant temperature is appropriate but the car radiator fan still does not work, the issue might lie with the fan relay. A faulty relay can prevent the radiator fan from functioning. 3. Thermostat switch malfunction: If neither of the above issues is present, the thermostat switch should be inspected. Sometimes, faults in this component can also affect the operation of the car radiator fan, so it is important to check this as well.
Last time my car's fan wasn't working, I spent ages troubleshooting it. Usually, it's a fan motor issue—either the bearings inside the motor rusted solid or the coils burned out, causing it to stop. The temperature sensor is also crucial—it tells the ECU when the temperature is high enough to turn on the fan, but if the sensor ages or gets clogged with dirt, it sends faulty signals and the fan won't run. Blown fuses are common, especially when the car's electrical system experiences excessive current; the fuse cuts off protectively and needs replacement. The relay, which controls the fan's start-stop function, can fail if its contacts wear out. Wiring issues like loose or oxidized connections or short circuits can disrupt current flow, and even water splashes from car washes can cause corrosion. Also, check if the fan is jammed or if the blades are broken. If left unfixed, the engine temperature can skyrocket, leading to cylinder seizure—costing thousands in major repairs. I suggest first checking the fuse box and listening for the relay's click sound; if that doesn't work, take it to a professional shop for diagnostics.
