How to test radiator fan

Unplug the fan connector, closest to the fan. Make up some jumper cables. Then connect them directly, from the battery to the fan motor, to see …

How can I check if my car fan is working?

Should radiator fans spin 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 know if you have a bad radiator fan?


What happens when a radiator fan stops working? It will cause a loud whirring noise and a stuck open thermostat (which will not allow the engine to reach the average operating temperature). A lousy radiator cooling fan could cause a blown circuit fuse, a malfunctioning relay, and engine overheating.

What sensor turns on the radiator fan?

coolant temperature sensor

On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor.

Should radiator fans push or pull?


Both give an identical cooling performance. Push-pull gives you better performance than push or pull, but it costs more. If you can afford the extra fans, the push-pull configuration is worth it. But it’s typically better to spend the extra money on a larger or a thicker radiator.

Should a fan clutch be hard to turn?

Electronic types might freewheel, but most fan clutches should spin with a little effort. If the fan spins more than three times, you may have a bad fan clutch. If the fan doesn’t spin at all, the bearing may be seized.

How do I know if my fan clutch is stuck?

A locked-in, or seized, fan clutch can cause radiator fans to fully engage at all speeds. Therefore, you could experience a constant droning noise from the fan at a higher volume than usual. You might notice more dust being blown from under the vehicle than normal when idling.

Will the check engine light come on if radiator fan is not working?

Common signs include engine overheating, the Check Engine Light coming on, and a broken or shorter signal wire.

Will the radiator fan work if the thermostat is bad?

Coolant temperature sensor issues If the CTS is bad, the fan will not turn on to cool your engine when it should. The result could be engine overheating.

Should radiator fan turn on when AC is on?

Q: Should the radiator fan run when AC is on? Yes. Both the radiator and condenser cooling fan are expected to turn on the moment you switch on the air conditioning system. For instance, it is expected for the cooling fan to switch on when the engine carries loads or once it reaches the normal operating temperature.

Can you manually turn on radiator fan?

Does thermostat turn on radiator fan?

The thermostat found in the cooling system will control many of the electric fans. When a certain preset temperature has been reached by the car engine, the radiator fan will begin to cool the engine. The fan will turn off eventually if the temperature goes below the preset engine temperature.

How do you test a radiator fan relay?

Do radiator fans with more blades work better?

The number of blades are balanced with the size of the motor, so the number of blades should not affect how much air is moved. The over all size of the blades can affect how much air is moved by the speed of the fan. Larger fan blades can move slower and move the same amount of air as smaller fans going faster.

Does radiator fan cool engine or radiator?


The radiator fan (or fans) pulls cooling air through the car’s radiator. Positioned between the radiator and engine, cooling fans are particularly helpful when the car is stationary or moving at speeds too slow to force air through the grille.

Do I need fans on both sides of radiator?

Using fans on both sides of the radiator is fine but if your radiator is cooling as well as it possibly can with fans on only one side, doubling your fan count is only going to cost more money and make the whole setup louder.

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.

How do you free up a fan clutch?

At what temp does a clutch fan engage?

about 170°F

At 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 temporarily fix a fan clutch?

How do you test a fan clutch on a car?

To confirm the diagnosis, start with this simple test: Spin the fan as hard as you can on an engine that has not been started that day. If the fan rotates more than five times, you can bet the clutch is bad. You should feel some resistance and the fan may spin up to three times, depending on the ambient temperature.

What happens when a fan clutch fails?

Overheating engine is the most common symptom of a bad or failing fan clutch. It controls the operation of the cooling fans. These cooling fans will disable/not work at maximum efficiency as the bad clutch will not engage properly. This result in overheating which may lead to serious issues if not timely attended.

How long does it take for the radiator fan to turn on?

But, on a normal 70–80 degree day you should hear the fan run, I would guess, after about 15 to 20 minutes of idling from a cold start. When the electric cooling fan operates is purely a function of the setting of the temperature switch used to control power to the fan.

What temp does radiator fan kick on?

about 200 degrees Fahrenheit

Your radiator fan should kick in at about 200 degrees Fahrenheit. If you notice your vehicle is overheating or at the very least running hotter than it normally does, listen for the fan to see if you can hear it.

Can I drive my car without radiator fan in the cold?

Yes, you can drive your car without a radiator fan, but you never should. Your vehicle’s cooling system is crucial to its performance, and every time your engine overheats, you cause damage.

Is a cooling fan the same as a radiator fan?

The cooling fan is also known as a radiator fan because it’s mounted directly to the radiator in some engine layout. Typically, the fan is positioned between the radiator and engine as it draws heat to the atmosphere. In front-wheel cars, the cooling fan used is an electrical component powered by the battery.

What can cause a radiator fan not to work?

Radiator Fan Not Working: Common Causes

  1. A Bad Fuse. It is a very common problem that results in radiator fan failure: the fuse may burn off or simply fall off. …
  2. Dead Wires. …
  3. Broken Fan Clutch. …
  4. Inadequate Coolant Level. …
  5. Defunct Temperature Sensor. …
  6. Bad Radiator Fan Motor.

How do you jump a radiator fan?

How do I run a radiator fan directly?


Stretch out the 12-gauge jumper wire and extend its other end to reach the vehicle’s battery. After that, you can test it by placing the wire on the battery. Once you place the other end of the second jumper wire on the battery’s positive terminal, the cooling fan will turn on and start spinning.

Is it good to connect radiator fan directly?

If the fan is direct, the engine remains cool all the time and doesn’t achieve the desired temperature as advised by engineers / required by the engine, the fuel doesn’t burns properly resulting un-burnt fuel goes into the engine oil gradually resulting in weak engine head etc etc.

Is it better to have 3 blades or 5 on a fan?

How Many Blades? There is a common misconception that five ceiling fan blades work better than four or even three blades. Homeowners assume that five blades means better air movement, circulation, and less cooling costs, but in reality, all five blades do is add aesthetic appeal.

Are 3 or 4 blade fans better?


4-blade ceiling fans are less noisy and are useful in rooms with an air conditioner, to move the cool air around. They are often more stylish looking. However, 4 blade fans may move air slower than a 3 blade fan and can be more expensive than 3 blade ceiling fans.

Are 4 or 5 blade fans better?

They can move more air and go faster, and noise is not much of a problem. Ceiling fans for home use usually have four or five blades. Aside from possessing an attractive symmetrical aspect, it’s the 5 blade level where the perfect balance between the noise and amount of air circulated is achieved.

What happens if you put a radiator fan on backwards?


Contrary to popular belief, a fan installed backwards does not move air in the opposite direction. That is, if a correctly installed fan draws air through the radiator, an incorrectly installed fan still draws air through the radiator – it does not blow air through the radiator.

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Tony Conover

Tony Conover, owner of Conover Racing & Restorations, Inc., has been in the car restoration business since 1977. His love of the Ford Mustang and Shelby, along with his vast knowledge of the history of these cars, led him to focus on Ford's classic muscle cars since 1977, with particular focus on Shelby Mustangs, and he believes that he has probably restored more R-models than any other restoration shop in the country. He fondly remembers the overwhelming originality of 5R531, which retained all of its original sheet metal, a far cry from many of the exhaustively raced and frequently damaged examples that have passed through his care over the years. Following Mr. Conover’s exacting year-long restoration, the car was bought in September 1990 by Buddy Belzer, of Rapid City, South Dakota, and soon after, it embarked on a successful exhibition run. Presented at the SAAC-18 meet at Watkins Glen in July 1993, 5R531 drove away with the 3rd place Popular Vote in the R-model class.

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