With the electronic fan clutch, is it normal to have the fan clutch barely running and that you can keep it from turning with one

The vehicle is not over heating, but the electronic fan clutch is barely turning. I can hold it still with one finger on start up. Is that common for this fan clutch?

My car has 120000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hello. This is normal operation of the fan clutch. The electronics should turn it on as needed. This saves on the power loss that is associated with the fan when it is needed to keep the engine cool. This increases the fuel mileage of the vehicle and can disable the fan for short periods when you need the extra power like accelerating up and on ramp to the highway or passing a vehicle. Unless you are having an issue with the cooling system or the A/C not working correctly then you should have no worries.

How to Identify and Fix Common car Problems ?

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Spring-operated fan clutches sense temperature from the bi-metal on the front of the fan clutch and electronically-controlled fan clutches are controlled by the vehicle`s Engine Control Unit (ECU), which measures temperature from sensors throughout the engine bay.
Secondly, an electric fan consumes less power from the engine compared to a clutch fan, which means that there is more power available to run the AC system. This can lead to improved AC performance, especially when the vehicle is idling or driving at low speeds.
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.
To test the fan motor, you will need a multimeter. Set the multimeter to the ohms setting and touch the probes to the two terminals on the motor. If the reading on the multimeter is infinite, then this means that there is an open circuit and the motor is defective.
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.
As your engine heats up, the thermal spring on the front of the clutch expands, which opens a valve allowing the silicon fluid to drive your clutch at an increased RPM. This provides more air flow through your radiator, preventing your car from overheating.
A roaring noise could mean a number of things, including a bad wheel bearing, worn tires, or a differential that`s low on oil. Often times, it`s the fan clutch. When the clutch shoe inside the part gets stuck, it fails to disengage. This causes the fan to lock up on the input shaft.
Fan speed is controlled with thyristor or transformer speed controllers. Thyristor speed control. Thyristor speed controllers provide smooth manual motor speed control and air flow control respectively. Operation of the thyristor speed controllers is based on output voltage control with a triac voltage regulator.
Decrease in power, acceleration, and fuel efficiency

A stuck fan clutch will cause excessive, unnecessary drag on the engine, which can cause a drop in power, acceleration, and fuel efficiency, sometimes to a quite noticeable degree.

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.
If you are more concerned with the amount of air it produces, the 5 bladed ceiling fan is a perfect option. But if you are looking for a ceiling fan with a smaller silhouette while still providing enough airflow, the 3 bladed ceiling fan is also a good choice too.
Absolutely, a bad one can damage your air conditioning system, as it acts as a heat exchanger for the air conditioning unit. The engine fan keeps the condenser cool which helps to keep the convertible`s AC system running smoothly.
There are three types of Fan Clutches, the Non-Thermal (also called centrifugal), Thermal Fan Clutch and Electronic.
A proper water pump replacement should include a new fan clutch as the two are connected to the same shaft and work together to move the air and cooling fluid. Replacing one without the other can damage the new part and cause repeat work or engine trouble.
The higher the CFM rating, the more powerful the airflow. Most fans, whether household fans or commercial/industrial fans, have more than one fan speed so you have a range of airflow. You want to look for the maximum CFM in the specification section to find the highest rate of airflow.
A fan will either be powered using alternating current (AC) or direct current (DC), and each current has a different set of voltages (V). An alternating current fan will have a voltage rating above 100 such as 110V or 240V. In contrast, a direct current fan will have a lower voltage rating such as 5V or 48V.
You may transport this item in carry-on or checked baggage. For items you wish to carry on, you should check with the airline to ensure that the item will fit in the overhead bin or underneath the seat of the airplane.
Electric fans are subjected to: functional tests and durability tests, tests of resistance to environmental conditions, measurements of electrical parameters and characteristics.
Whistling. A whistling or whining noise coming from the engine bay can be pretty serious. There`s a number of possible causes for the whistling noise, but one of the most common causes is a loose serpentine belt. When this happens, the fan clutch is not engaged properly.
Turn your fan on to make sure that the motor works.

If you don`t hear anything, put your ear up to the middle of the case behind the blades. Press the button to turn the fan off and on again, this time listening closely for the motor. If you hear it humming or buzzing, your motor is likely still functioning.

Whistling. A whistling or whining noise coming from the engine bay can be pretty serious. There`s a number of possible causes for the whistling noise, but one of the most common causes is a loose serpentine belt. When this happens, the fan clutch is not engaged properly.
Absolutely, a bad one can damage your air conditioning system, as it acts as a heat exchanger for the air conditioning unit. The engine fan keeps the condenser cool which helps to keep the convertible`s AC system running smoothly.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

With the electronic fan clutch, is it normal to have the fan clutch barely running and that you can keep it from turning with one
ANSWER : Hello. This is normal operation of the fan clutch. The electronics should turn it on as needed. This saves on the power loss that is associated with the fan when it is needed to keep the engine cool. This increases the fuel mileage of the vehicle and can disable the fan for short periods when you need the extra power like accelerating up and on ramp to the highway or passing a vehicle. Unless you are having an issue with the cooling system or the A/C not working correctly then you should have no worries.

My cooling fan won’t turn on when I turn the ac on. Relays and fuses are good, tested the fan with the battery and it came on??
ANSWER : Hi there. In general, a situation like this occurs when either the thermostat housing or temperature sensor is not relaying the information to the fan motor to activate. However, it’s also possible that there is some electrical short within the cooling system relay’s that is causing the fan motor to not activate when it should. I think the best way to determine the precise source of this problem is to have a professional mechanic come to your location to complete an onsite inspection so they can test all systems to help isolate the root problem and recommend the right repairs.

Just replaced head gasket, changed crack sensor new plugs. The check engine light is on, but dim, the only other light that the dash is a normal battery indicator. The fuel pump is not running when switch is turned on, the power windows don’t work, it turns over but not firing. It’s like only one part of the system is working. Also the heater fans work even if the switch is off.
ANSWER : I would first look at the diagnostic trouble codes. Those codes are available because the check engine light is on. If the fuel pump is not running (momentarily) at key on, that fault alone will prevent the car from starting as there will be no fuel pressure. Pump output and pressure can be directly tested and you can also check for electrical power to the pump. To find out why the engine will not run, the recommended diagnostic is a no start diagnostic. If you request that service, the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

When replacing my fan clutch should I change my cooling fan to a flex-a-light and get a new flex-a-light clutch?
ANSWER : Hi there. It is best to always put on the OEM parts that are required for the vehicle. However, you can get a flex-a-light clutch fan for your vehicle as long as it will bolt up to your water pump pulley and clear the radiator and shroud. I recommend having a clutch design fan for your vehicle and not a fan that spins with the engine all the time. Those fans will cause the engine to overheat on highways and in town especially in hot weather. If you need further assistance with your cooling fan, then seek out a professional, such as one from Your Mechanic, to help you.

A/C compressor clutch does not engage, cooling fan does not turn on, condenser fan does not turn on, and ceiling light does not turn on.
ANSWER : Hi there. The air conditioning clutch could be not working for the refrigerant could be low or the clutch could be burned up. Check the air conditioning compressor clutch wiring for a voltage with the a/c switch on high and fan on high. If there is a voltage present then the clutch is burned up and needs replaced. If there is no voltage present, then the system could be low on refrigerant or the low or high side pressure sensor has failed. If there is voltage to the sensors and nothing past the sensors, then the system is low on refrigerant. If there is no voltage to the sensors, then the a/c switch would need to be replaced.

The cooling fans and condenser fans either are not coming on from a loss of power or the motors are burned up. First check the cooling fan circuit. If there is no power to the cooling fan, then check the fuses and see if they are burned. If the fuse is good, then check the cooling temperature sensor / switch. If the sensor has power to it an after, then the switch is working. If there is no power after the switch, then the coolant temperature sensor / switch would need replaced. If there is power to the motors on the cooling fan, then the fan motor is burned up and needs replaced. For the condenser fan, if there is no power to the fan, then check the fuses for any of them burned. If the fuses are good, then the a/c switch would need to be replaced. If there is power to the motor, then the condenser fan motor is burned up and will need to be replaced.

For the ceiling light (courtesy light) is not working when the door is open, then there could be an issue with the bulb being burned or the switches are damaged. First check to see if the light is just turned off. If the light is on the door settings, then check the doors one at a time and see if the door courtesy light switch is broken, stuck, or has a loose or corroded ground. If the ground is good and there is no problems with the switch wiring, then I recommend replacing the door courtesy light switch.

For the parking brake light always on, check to see if the parking brake lever is all the way down in the unlock position. If the lever is all the way down, then check the parking brake sensor on the parking brake lever and see if it’s working.

If you need further assistance with the issues your are facing, then seek out a professional, such as one from Your Mechanic, to help you with the following:

air conditioning compressor clutch not working
cooling fans and condenser fans not working
courtesy light not working with the door open
parking brake light always on

engine cooling fan keeps running after car is turn ed off. New fan installed. problem still happens. aslo coolant and temperatu
ANSWER : A fault with a fuse would more likely result in non operation rather than continuous operation. ECM’s rarely go bad, indeed of the ones "claimed" to be bad, that is of those sent in as warranty returns, based on surveys fully half of those "returns" are perfectly good on subsequent testing. You might have a stuck relay and there may be other devices or controls in the circuit that are malfunctioning. The temperature sensor should be double checked. All that has to be checked with a wiring diagram in hand to make sense of the diagnostic. Your best bet is to request an electrical component diagnostic – radiator cooling fan circuit and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Some times i turn the key and it starts up like normal but then shuts off after 1 second
ANSWER : You will need to check the purge control valve on the firewall near brake master cylinder. The purge valve may be letting too much vapor into the intake causing the stall or hard start.

There also may be an issue with shorted ignition coils in the spark plug holes. The plug boots may need to be replaced.

If you’d like some assistance with these checks, consider YourMechanic as one of our mobile experts can come to you and diagnose your starting issue firsthand. Best of luck.

noise when car is running, sounds like wu, wu ,wu
ANSWER : Hello. Thanks for writing in. There a few things we need to clarify before we can begin delving into the issue. First, are we referring to you cooling system and engine fan, or the blower motor fan which is used for the cabin climate control? If this is the climate control fan we are talking about, then we need to know more about the conditions in which it is being run. Does this happen with the heater and the A/C, or with one or the other? Does this happen on all fan speeds? With this kind of information, we can determine what component may be to blame. Without some of these details, its nearly impossible to tell what the cause of the noise is.