Wiktor Wise
The fan clutch plays a crucial role in the cooling system of your vehicle. It regulates the operation of the engine cooling fan, ensuring that it runs at the right speed to cool the engine effectively. Fan clutches can develop issues over time, which may lead to engine overheating and potential damage. Therefore, it's essential to regularly check your fan clutch to ensure its proper functioning. Testing your fan clutch can be done in several ways, including checking for fan clutch engagement, conducting a fan blade resistance test, and performing a temperature differential test. If you're unsure about the condition of your fan clutch or unable to perform the tests yourself, it's recommended to consult a qualified mechanic.
| Characteristics | Values |
|---|---|
| Fan clutch function | Tests the temperature of the air coming through the radiator and prevents the engine from overheating |
| Fan clutch location | Bolted to the water pump in the engine compartment |
| Fan clutch appearance | Approximately 1 foot tall by 1 foot wide |
| Fan clutch types | Thermal and non-thermal |
| Non-thermal clutch function | Operate continuously at 30 to 60% engine rpm, less efficient, rob power from the engine and lower fuel economy |
| Thermal clutch function | Thermally activated spring opens a valve allowing silicone oil to fill a cavity, causing the fan to increase speed |
| Testing the fan clutch | Listen for a gentle roar from the fan clutch when driving at 50 mph or above, which can indicate binding or locking up |
| Testing the fan clutch | Push the fan clutch gently; if it spins more than three rotations, it may be prone to slipping |
| Testing the fan clutch | With the engine off, spin the fan by hand; some resistance indicates the clutch is working, no resistance means the clutch is bad |
| Testing the fan clutch | Wobble the fan; if it wobbles, the bearing is bad and the clutch needs to be replaced |
| Testing the fan clutch | If the fan has heavy resistance or is frozen, the clutch is bad |
| Testing the fan clutch | Check for signs of silicone radiating from the centre of the clutch, indicating a failure |
| Testing the fan clutch | Observe fan speed when the engine is started; if the fan freewheels when cold and doesn't increase speed as the engine warms, the clutch has failed |
| Testing the fan clutch | Check fan speed with a photo-tachometer, an inexpensive tester |
| Testing the fan clutch | Observe fan speed as engine RPM increases; if the fan doesn't slow down at higher speeds, it may be defective |
| Testing the fan clutch | Perform a "flotation test" by throwing the clutch into water; if it floats, reinstall it, if it doesn't, buy a new thermal clutch |
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What You'll Learn
Check for fan clutch engagement
To check for fan clutch engagement, start your vehicle and listen for the fan to engage. Give the engine a little time to warm up. After 4-5 minutes, the fan clutch should come to life. If the fan clutch doesn't engage, or if it's sluggish when it finally gets moving, it may be faulty. The same is true if the fan speed accelerates as soon as you start the vehicle. If the clutch does not engage when the AC is turned on and a voltage is present, this is a sign that the fan is damaged. Some fan clutches are designed with a built-in thermometer somewhere on the instrument panel. If your unit has one, keep an eye on the temperature so you’ll know when the fan speed should begin ramping up. If the fan still hasn’t kicked in by the time the temperature reaches about 200 °F (93 °C), there’s likely a problem.
You can also try to spin the fan by hand. Grab the edge of one of the blades and give it a good push. While there should be a little bit of give, it shouldn’t spin more than three complete rotations. Too much free-wheeling usually indicates that the clutch is prone to slipping. Conversely, too much resistance means the clutch is binding and can’t turn freely. In either case, the clutch will likely need to be replaced. Ideally, the fan shouldn’t spin more than 1-1½ times.
Another test you can perform is the Temperature Differential Test. Start the engine and let it idle for a few minutes. Use a temperature gun or an infrared thermometer to measure the temperature at various points around the engine, including the radiator, coolant hoses, and thermostat housing.
If your fan clutch is electronically controlled, you can put +12V to the white wire, which will put the fan to 100% engagement. Alternatively, you can unplug the fan clutch connector and run the engine at 2000 rpm for 2 minutes. The fan should not be roaring or fully engaged, and the fan clutch should be disengaged with no voltage applied.
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Conduct a fan blade resistance test
Conducting a fan blade resistance test is a great way to evaluate the condition of your electric fan clutch. Here's a step-by-step guide on how to do it:
Firstly, ensure your vehicle is parked, the engine is off, and the handbrake is engaged. It's important that the engine is cooled down before you begin the test. Once that's done, carefully open the hood to access the fan clutch.
Now, locate the fan clutch. It's usually bolted to the water pump in the engine compartment, and it's about one foot tall by one foot wide. With the engine off, grab the edge of one of the fan blades and give it a good push. You should feel some resistance, and the fan should not spin freely. A properly functioning fan clutch will prevent the fan from spinning freely and will offer some resistance.
If the fan blades spin more than three complete rotations, it indicates that the clutch is prone to slipping and will need to be replaced. On the other hand, if the fan shows too much resistance or binds and can't turn freely, it's also a sign that the clutch is faulty and needs replacement. Ideally, the fan shouldn't spin more than 1 to 1.5 times with a gentle push.
If you're unsure about the condition of your fan clutch or uncomfortable performing the test, it's always recommended to consult a qualified mechanic. They have the expertise and tools to diagnose and repair any fan clutch issues accurately.
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Listen for a gentle roar when driving at 50 mph
When driving at 50 mph, listen out for a gentle roar from the fan clutch. This sound is an indication that the fan clutch is binding or locking up. The air passing through the fan clutch when it binds or locks up can produce a gentle roar that is audible from inside the vehicle cabin.
The fan clutch is responsible for testing the temperature of the air coming through the radiator and preventing the engine from overheating. Binding or locking up can lead to critical overheating, decreased fuel economy, and poor general performance.
If you notice the gentle roar, locate the fan clutch bolted to the water pump in the engine compartment. The fan clutch unit is approximately 1 foot tall by 1 foot wide. Then, test the fan clutch by giving it a good push. If it spins more than three full rotations, this indicates that it may be prone to slipping and will need to be replaced by a qualified mechanic.
It is important to note that you should never attempt to manually test your fan clutch while the vehicle is running. Always ensure the vehicle is switched off and in park, with the handbrake firmly engaged before attempting any tests.
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Observe fan speed with a photo-tachometer
To test a fan clutch, you can observe the fan speed with a photo-tachometer. This is an inexpensive tester that uses an infrared beam aimed at a strip of tape, usually attached to the edge of a spinning fan blade. This method is particularly useful if the manufacturer provides specifications, even if they are approximate.
For example, on some late-model Jeep Grand Cherokees, the factory spec is 300 rpm max with the engine cold. In this case, the electric fan is a major contributor to engine cooling. On other systems, with a cool engine, you'll find fan speeds at about 1250 to 1500 rpm when the engine is revving at 3000 rpm. At high coolant temperatures, the fan speed will rise to about 2100 to 2500 rpm with the engine revving at 3000 rpm.
Therefore, by observing the fan speed with a photo-tachometer, you can compare the readings to the manufacturer's specifications and determine if the fan clutch is functioning correctly.
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Perform a flotation test
There are several ways to test an electric fan clutch, and one of them is to perform a flotation test. This test is specifically for non-thermal fan clutches, which are less common and less efficient than thermal fan clutches. Non-thermal clutches operate continuously at 30 to 60 percent engine rpm, and they lack the thermally activated spring that characterises thermal fan clutches.
To perform a flotation test, take the fan clutch to a river or lake and throw it into the water. If the fan clutch floats back to you, you can reinstall it. If it does not float, then it is faulty, and you should buy a thermal clutch as a replacement.
- Listen for excessive noise when driving at high speeds. A binding fan clutch will often produce a gentle roar that is audible from inside the vehicle.
- Observe the fan speed as you increase your vehicle's speed. If the fan continues to run at the same rate when your engine reaches about 2,500 RPMs, it may be defective as it could result in too much cooling.
- Inspect the fan clutch for any signs of damage or wear, such as cracks, leaks, or loose connections.
- Check the engagement of the fan clutch by starting your vehicle and letting it idle until the engine reaches its normal operating temperature. Then, open the hood and observe the fan. If the fan is not spinning or is spinning too slowly, it indicates a faulty clutch.
- Conduct a fan blade resistance test. With the engine off and cooled down, try to spin the fan blades by hand. If the fan blades spin easily without resistance, it may suggest a worn-out or failed fan clutch.
If you are unsure about performing these tests yourself, it is recommended to consult a qualified mechanic.
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