Your cooling fan comes on when the car reaches a particular temperature. The trigger is the thermostat in the radiator of your vehicle.
It is what sends the signal for the fan. Most cars will switch the cooling fan when the coolant temperature reaches 85 degrees Celsius degrees Fahrenheit. Most fans should come on when the coolant reaches about to degrees.
The ohmeter should be turned on and have a reading of high resistance. When the water reaches between to degrees Fahrenheit, the switch should turn on and the resistance seen by the ohmmeter should change to zero. If the resistance does not change to zero, then the switch is bad.
This typically takes about minutes for the engine to reach the right temperature for the radiator fan to turn on in older cars. If your fan has still failed to turn on when the car starts, you can check the fan by connecting a power source to it.
Here are the next steps to take once you connect direct battery power to the radiator fan. First, you need to unplug the wiring connector. Check for any damage and clean the connector to get rid of any debris or contaminants. Ensure that the wires are firmly attached and are not damaged. Second, look at the wires and identify which ones are power wires and which ones are ground wires to avoid any confusion.
You may need to look at your vehicle repair manual to see if your vehicle has a 4-wire terminal or three terminals, with two for power and one for ground wires. Lastly, after you connect the radiator fan to your battery, the radiator fan should turn on when you start your car.
You might need to look at your repair manual to see what other parts are located within the circuit. For this test, the only tool that you need is a test light to see why your radiator turns on when you start your car. First, you need to connect your test light to the battery ground. Second, start the engine and start idling your vehicle. Back probe the connector terminals with the test light — hopefully, one of the connector terminals is able to turn on the test light and show that it is working properly.
Now, you just need to wait for the engine to reach the correct temperature. After the engine has reached operating temperature, you have to probe the other wire at the connector.
After noticing during the radiator fan inspection that something is wrong with your radiator fan or fan clutch, you now know you need to get a replacement. You can always tell that something is wrong with your radiator fan not turning on when you start your car. In addition, there are other obvious signs of a bad or failing fan motor. However, if you are able to notice the telltale signs and symptoms of a bad or failing radiator fan motor , you might be able to stop the problem before it gets worse.
The most common symptom of a faulty cooling radiator fan motor is that the cooling fan does not come on when you start the car.
If the cooling fan motor burns out, the cooling fans will then, in turn, be disabled. Since the cooling fan motors work in tandem with the fan blades to pull air through the radiator, the blades will then not be able to spin or cause any airflow to cool off the car. The second symptom of a damaged radiator fan motor is that your car is currently overheating. The cooling fans are designed to turn on once a certain temperature has been reached inside of your vehicle, or certain conditions have been met.
If the cooling fan keeps running, even when the engine is off, this could be due to the following reasons:. Often, the fan constantly runs if its negative wire is frayed. Depending on the engine, the wires can be located in different places. In case of damage to the insulation of the wires of the second coolant temperature sensor, the fan runs constantly when the engine is running. The incorrect operation of the ECU can be caused by a malfunction in its software for example, after a flashing or if moisture gets inside it.
As moisture, there can be a banal coolant that got into the ECU. This applies to both the main radiator and the air conditioning radiator.
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