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What causes the fan noise when the car is off? If you’re noticing that the fan speeds up when the car is off, you might have a faulty radiator control module. In most cases, though, the noise is caused by a faulty fan blade. To stop the noise, you need to replace the fan or repair the radiator control module. However, if the problem is only intermittent, you might want to check the fan blades and engine cooling system for broken fan blades.
Engine cooling fan
While many drivers think that shutting off their cars’ engines will stop the noise, that’s not always the case. Engine cooling fans and other systems can continue running when the car is turned off. A BestRide reader recently purchased a Mazda CX-5. He parked it in his garage and then turned off the engine. When he got out to start the car, he noticed that the engine cooling fan was still running.
A simple solution to this problem is to check the coolant level in your car. You can check this yourself by looking for a coolant gauge on your dashboard. The engine cooling fan is controlled by an electronic system that receives a signal from the coolant temperature sensor in the engine. If it’s not, the fan won’t run when it’s needed and could lead to overheating. You can also try replacing the fan relay or the fuse.
Broken fan blades
If you notice that your car has a clunking noise, chances are the fan blade has snapped off. Broken fan blades are usually plastic and are likely the result of excessive fatigue. While a broken blade may not be dangerous, it is highly advisable not to drive with it. Similarly, a loose fan mounting could be rubbing on other parts of the engine and vibrating against it. To avoid the clunking noise, tighten the fan mounting.
Overheated engine components
An overheated engine component can cause a fan noise even when the car is off. The cause of this problem can be several. Overheated engine components can cause the check engine light to come on or the dashboard temperature gauge to read too high. If you notice this problem, a simple repair like replacing the thermostat can get rid of the problem. If you suspect the problem is more serious, a certified ASE mechanic should check the cooling system to make sure that it is functioning properly.
An overheated engine can also cause the radiator to fail. A properly functioning radiator can prevent an overheated engine from causing damage to other engine components. In some cases, the overheated engine can lead to burst hoses and exploding cooling systems. In order to avoid this problem, it is important to prevent overheating from occurring. To do this, follow these tips and check for any possible engine component problems.
Faulty radiator control module
The first thing to check is the radiator. If you hear a noise when the car is off, chances are that there is a problem with the radiator fan. If this is the case, the first thing to do is to remove the radiator shroud and inspect the fan. If it is damaged, it may need to be replaced or tightened. Note that the mounting bolt on the radiator fan is reverse-threaded, so you will need a special wrench to remove it.
Alternatively, check to see if the fan terminal is corroded or damaged. If the radiator fan motor is still running, check the incoming voltage on a digital multimeter. If the voltage is present, the fan should be running. If it does not, check the radiator for blown fuses, shorted wires, or damaged terminals. These problems may be indicative of a faulty radiator control module.