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should a fan clutch spin freely when hot

by Foster Abshire Published 4 months ago Updated 2 months ago
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Should the fan clutch spin freely when hot? When the clutch is hot, it should engage with the drive portion and become immovable by hand. If your clutch is spinning freely when the engine is hot, that means that the clutch failed in the closed position.Mar 17, 2022

Full Answer

How to tell if a fan clutch is bad?

As the temperature rises, the clutch gets engaged, and it allows the fan to circulate the necessary air for cooling the engine. Whether the engine is hot or cold, if you can spin the fan clutch freely, it is a symptom of a failing fan clutch. If it is alright, there should have been enough resistance not to allow it to spin freely.

How tight should a fan clutch be?

Your fan clutch should be tight enough to not spin freely on its own. It should be resistant and if you try to spin it, it should spin about ½ to ¾ of a turn. If it makes 3 spins, your fan clutch is not tight enough and you need to inspect it for problems.

How does a thermal fan clutch work?

This engages the clutch and drives the fan. Once the engine is cooled down, the thermal spring rotates back and closes the valve ports, disengaging the fan. The speed at which a thermal fan clutch spins a fan depends largely on the exact fan you choose.

What are the different types of fan clutches?

Types of Fan Clutches 1 Non-Thermal Fan Clutches. Non-thermal clutches operate solely based on the shaft speed of the water pump. ... 2 Thermal Fan Clutches. The thermal fan clutch operates in response to underhood temperatures. ... 3 Electronic – Viscous EV Fan Clutch Operation. ...

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How hard should a clutch fan be to turn?

While there should be a little bit of give, it shouldn't spin more than three complete rotations. Too much free-wheeling is usually a sign that the clutch is prone to slipping. On the other hand, too much resistance means the clutch is binding and can't turn freely.

How much should a clutch fan spin?

You should feel some resistance and the fan may spin up to three times, depending on the ambient temperature. But even if it rotates three or fewer times the clutch could still be bad.

What are the symptoms of a faulty fan clutch?

Symptoms of a Bad Fan ClutchEngine overheating at low speed or when stopped is the most-common fan clutch failure symptom. ... Insufficient heat in winter is another common problem but caused by the opposite fan clutch failure. ... Excess fan noise at high speed is caused by the same problem, a seized fan clutch.More items...•

Should a fan clutch engaged when cold?

A thermal fan clutch is engaged on a cold startup because the fluid drains into the working area when the engine is shut off. The fan clutch will slow down shortly after startup as result of a pumping action produced by a difference in speed between the shaft and the body of a clutch.

Should a clutch fan move freely?

Should the fan clutch spin freely when hot? When the clutch is hot, it should engage with the drive portion and become immovable by hand. If your clutch is spinning freely when the engine is hot, that means that the clutch failed in the closed position.

Should radiator fan turn freely?

If there is no clutch, the fan would be difficult to turn because you would have to turn the fan and the pulley, which are turned by a belt. If the fan is turning freely with no clutch, then there is a problem with either the belt being loose or the pulley will need adjustments.

How do you test a car fan?

9:3817:52Overheating Help! | Testing Cooling Fans - Relays - ConnectionsYouTubeStart of suggested clipEnd of suggested clipCheck the motor itself so this is for the low-speed. We'll do the exact thing a very very similarMoreCheck the motor itself so this is for the low-speed. We'll do the exact thing a very very similar thing to test for high-speed. Now the test with a high-speed.

What controls a fan clutch?

A thermal clutch fan operates using silicon fluid as a viscous coupling medium. When the clutch is cool and disengaged, most of the silicon fluid is stored in the reservoir allowing your fan clutch to slip relative to your water pump shaft thereby spinning at a lower RPM than the water pump.

How do you test a clutch fan solenoid?

An easy test for the function of the solenoid only is to start the truck, let it run and wait for the fan to disengage when air pressure builds to normal. If you then shut the truck off, which kills power to the solenoid, you should immediately hear the solenoid vent the air that is in the line going to the clutch.

When should a fan clutch engage?

about 170°FAt what temperatures do fan clutches engage? Answer: Most fan clutches engage at about 170°F air temperature (about 180-190°F engine temperature). They reduce the temperature about 20°F before disengaging.

How do you check a fan clutch on a Chevy?

1:593:40Cooling Fan Clutch Inspection GMC Chevrolet - YouTubeYouTubeStart of suggested clipEnd of suggested clipIt needs to sleep when the RPM goes up and down but it needs to give some resistance. So if you justMoreIt needs to sleep when the RPM goes up and down but it needs to give some resistance. So if you just take your hand and spin it around like this and it keeps spinning.

How do I know if my clutch fan is bad on my Jeep?

0:582:01How to test your 1997-2006 Jeep's Fan Clutch! - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo when the jeep is hot it becomes harder to turn basically it's locking that in to make that fanMoreSo when the jeep is hot it becomes harder to turn basically it's locking that in to make that fan move faster. Now in the case of this one this one is hot. Now.

What does reverse rotation on a fan clutch mean?

Use of the wrong fan clutch can result in failure of the fan clutch and extensive damage to your engine. Clockwise or counter-clockwise rotation of the fan blade is defined as viewed from the front of the vehicle looking toward the rear. The replacement counter-clockwise fan clutch will be marked “REVERSE”.

How to get a can of ice cream to work?

Pull trigger while gradually shaking the can and holding it upside down until it reaches instructed pressure depending on Ambient temp.

Is it normal for a needle to be hot?

It's not normal hot, although I will look at that diagnostic mode. The needle is reaching the danger zone, definitely overheating.

Is a clutch expensive?

The clutch is not that expensive, but can be a pain to replace. I broke 2 wrenches and spend 2 hr only because my center bolt was torqued above 100 ft-lb.

Can you test a clutch by hand?

Since it's a fluid connection (much like a transmission torque converter) it's driven off the engine. So if you shut off the engine and spin it by hand (hot) it can spin.

Does the W210 cooling system work?

The W210 cooling system appeared to be impressive when everything worked. Last summer, it's the first time I drove the E430 to Vegas,, in early afternoon,,, the heat was at the peak,,,, along the 17-mile uphill where they warned to turn off AC to avoid overheating,,,,, I left the AC running to check it out. The temperature gauge stayed at low 80 to mid 80 degrees C all the way. In other years, I only drove my V8 Crown Vic to Vegas but the AC must be turned off uphill.

How Does A Fan Clutch Work?

As a cooling device in your engine, the fan clutch helps to maintain proper cooling by regulating the operation of your engine’s cooling fans. When considering the fan clutch, it’s important to remember that it has many internal components that are critical to its operation. Along with a connection, it is equipped with clutch plates. The latter is filled with oil and is equipped with a valve that regulates the flow of oil between the two sections of the engine compartment.

Should A Fan Clutch Spin Freely When Cold?

While an electronic fan clutch may spin at will, a decent fan clutch will only spin when you exert some effort to make it a spin. Now, if it spins more than three times, it is indicative of a faulty fan clutch, as previously stated. When a fan clutch is cold, the maximum amount of spin it can produce is approximately ½ to ¾ of a turn.

How does a fan clutch work?

The latter fills with oil and has a valve that controls the flow of oil between two compartments. One acts as a holding area while the other directs to the clutch. As the valve opens , the oil enters the clutch, and this leads to the fast movement of the fan. When the valve closes , the oil moves back to the holding area, and this leads to slipping in the clutch. Eventually, the movement of the fan slows down. Do you now see how all this comes together?

Why is my clutch fan not working?

Where this happens, the oil cannot cool the engine as needed, and problems will arise from the same. Additionally, the oil may leak , and the clutch may come loose . In any of these cases, the clutch would not work as it should. There have been cases where fan clutches spin freely when cold, and when this happens, you have a problem in your hands.

Why does my clutch make a noise?

It is common when facing issues such as fan clutch stuck engaged or fan clutch hard to spin. In this case, air will move through, and owing to the pressure; there will be the creation of a noise that is similar to a roar. You can hear this when inside the vehicle. These noises are common when driving the car at high speed. Thus, the next time you are on the road, increase your speed, and listen to your vehicle. If the noises are loud, you probably have some binding problems which lead to warm air in the cabin. With the fan not turning, this summer will feel longer than it is.

How to know if clutch is bad?

Accelerate the car and watch how the fan reacts to this. Where the clutch is fine, the cooling rate should reduce to allow the rushing wind to cool the engine. If the fan works at a faster rate, you have a problem.

How long does it take for a clutch to engage?

When you start your car, it should take about five minutes for the clutch to engage, and you should hear this. After this comes the roar of the fan, designed to give you an enjoyable driving experience. If you turn the car on and the engagement does not take place, you could have a problem.

How to know if AC is working?

The air passing through the vehicle should feel cool when the AC is working as it should. However, when the clutch is not at its best, the cooling will be minimal. You can test this by switching on air conditioning at the coldest level. You should notice a sharp decrease in warmth within minutes if everything is as it should be. Where the air remains warm and does not cool down, you may have a problem. Start by checking all the vents to ensure that the temperature is the same throughout the car. In some cases, the outlets could be the cause of your concern. It also helps to hold your hand near the vents to feel the changes more than you would when leaning back on your seat.

What is the role of clutch in a car?

The clutch, though small, plays a vital role in the functioning of your car. It gauges the temperature of the air coming into contact with the radiator and protects the engine. When this component does not work as expected, you can look forward to a myriad of problems.

What is a Fan Clutch?

A fan clutch is a temperature-controlled coupling between the water pump shaft and the fan which allows the fan to be operational at low speeds and disconnected at higher speeds. This allows the engine to operate more efficiently by removing the load that the fan places on it.

Why is fan clutch important?

The oft-overlooked fan clutch doesn’t get a ton of credit or attention, but it’s an essential piece of the cooling equation in many vehicles. It helps your cooling system operate effectively and your engine operate efficiently. But let’s start at the beginning.

What is non thermal clutch?

A non-thermal clutch provides a steady flow of cooling air but is always engaged, so it offers lower fuel savings than a thermal-style fan clutch. However, non-thermal clutches are a lower-cost option than thermal-style clutches.

What happens to the silicone fluid in a fan clutch?

At high speeds, the silicone fluid within in the clutch will lose its ability to transfer the energy from the shaft to the fan clutch body (and therefore, the fan) and the fan is then allowed to almost free-wheel, removing its load from the engine. A non-thermal clutch provides a steady flow of cooling air but is always engaged, ...

How does a thermal fan clutch work?

The thermal fan clutch operates in response to underhood temperatures. As hot air blows across the radiator, it heats a thermal spring mounted at the front of the clutch. As the spring is heated, it turns and allows valve ports to open within the clutch. Silicone fluid stored inside a reservoir is allowed to pass through these open ports and enter the working area of the clutch. This engages the clutch and drives the fan. Once the engine is cooled down, the thermal spring rotates back and closes the valve ports, disengaging the fan.

What is the standard duty fan clutch?

Standard-Duty Thermal Fan Clutch: This design turns the fan at 60-70 percent of the water pump shaft speed when engaged, and 20-30 percent when disengaged. It’s made for fans with a lighter pitch.

What type of fluid is used in fan clutches?

Types of Fan Clutches. The main types are non-thermal, thermal, and electronic — all of which use a silicone fluid to engage and disengage your fan.

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