Your Ford F-150 fan can be loud if coolant levels are low, coolant temperature sensors are bad, and radiator fan blades are loose or damaged. This issue can also be caused by the following factors:
- Worn bearing/clutch
- Poorly covered fan motor
- Bad A/C expansion valve
- Stuck fan control relay
- Clogged radiator
- Faulty water pump
This is not the whole thing you need to know about why your Ford F-150 fan is so loud. Continue reading for a comprehensive remedy.
11 Reasons Why Ford F150 Fan Can Be So Loud
There are 9 most common reasons responsible for the Ford F-150 radiator fan noise. Refer to the table below for a quick overview of those issues.
| Reason | Diagnosis | Solution |
| Low coolant level | Check the coolant level | Refill coolant |
| Unclean radiator coolant | Inspect the coolant | Drain and refill the new coolant |
| Stuck fan control relay | Inspect the fan control relay | Replace the fan control relay |
| Poorly covered fan motor | Check the fan cover bolts | Cover the radiator motor correctly |
| Bad coolant temperature sensor | Check the faulty coolant temperature sensor trouble code | Replace the coolant temperature sensor |
| Loose or damaged fan blades | Visually inspect the fan blades | Replace the fan blade |
| Worn bearing/clutch | Examine the bearing/clutch | Replace the fan clutch |
| Bad A/C expansion valve | Check the A/C expansion valve with a manifold gauge | Replace the A/C expansion valve |
| Faulty thermostat | Scan with an OBD scanner | Replace the thermostat |
| Clogged radiator | Inspect the radiator | Replace the radiator |
| Faulty water pump | Examine the other symptoms of the faulty water pump | Replace the water pump |
Now let’s move on to a brief discussion of these issues and their potential diagnosis and solution.
Reason 1: Low Coolant Level
When the coolant level in your Ford F150 radiator gets too low, it can cause a loud noise in the cooling fan. This happens because there isn’t enough coolant to absorb the heat from the engine. As a result, the engine heats up quickly, and the fan has to rotate faster and for a longer period to cool the engine down. The fan noise, as a result, may become louder because of its faster-than-usual rotation speed.
Diagnosis: Check The Coolant Level
Follow these steps to check the coolant level in the Ford F-150.
Step 1: Locate the radiator coolant reservoir
The Ford F-150 radiator coolant reservoir is located in front of the engine compartment on the driver’s side under the hood.
Step 2: Check the coolant level
Open the cap of the coolant tank and check the coolant level. When the engine is cold, the coolant level should be at or slightly above the “MIN” mark on the tank. Once the engine has warmed up, the coolant level should be at or near the max mark.
If the coolant level in the reservoir is below this range, you need to refill it at the optimum level.
For better guidance on how to check the radiator coolant level, you can also refer to the video below.
Solution: Refill the coolant
In the diagnosis process above we’ve already mentioned how to locate the coolant reservoir and check the level. To proceed, simply add coolant until the maximum level is reached, securely fasten the reservoir cap, and start the engine to verify proper functionality.
However, if the abnormal noise persists despite adequate coolant replenishment, additional issues may be at play. For further diagnostic steps and potential remedies, proceed to the subsequent section of this article.
Reason 2: Contaminated Radiator Coolant
Dirty coolant in the Ford F150 radiator fan can cause a loud noise. When the coolant becomes dirty, it can lead to clogs in the radiator and other components. These clogs can disrupt the flow of coolant and make the radiator fan work harder. As the fan works harder, it generates a loud noise.
Diagnosis: Inspect the Radiator Coolant
To check if the radiator coolant in your Ford F-150 is dirty, you don’t need any specific tools. Just follow these steps:
Step 1: Find the radiator overflow tank
To find the radiator overflow tank, refer to steps 1 and 2 mentioned in the low coolant section.
Step 2: Inspect the coolant
Remove the main hose going radiator to the thermostat. Then drain the coolant to a drain pan and inspect it. If the coolant is dirty it will look more dark. In some cases, there will be some visible debris.
This requires draining the coolant and refilling it with new coolant.
Solution: Drain and Refill the New Coolant
To refill the radiator coolant in your Ford F-150 follow step 1 of the above section and drain all the coolant. Then follow all the steps mentioned in the refill coolant level.
Reason 3: Stuck Fan Control Relay
When the radiator fan relay gets stuck in a Ford F150, it can cause noise. The relay is responsible for controlling the operation of the fan. When it gets stuck, it may keep the fan running constantly or prevent it from running at all. This can lead to unusual sounds coming from the fan area. The noise can range from a buzzing or humming sound to a loud grinding or rattling noise.
Diagnosis: Visually Inspect the Relay
To locate the fuse box for the Ford F-150 under the hood, follow these steps.
Step 1: Locate the relay
Firstly, identify the specific relay responsible for the radiator fan. The fan control relay on the 2023 Ford F-150 is numbered 8 and has a 20A rating. However, it’s important to note that the relay may vary depending on the model year. For precise information, it is recommended to consult the owner’s manual to locate the exact relay for the radiator.
Step 2: Inspect the relay
Once you have located the fuse box, visually inspect the relay by using a fuse removal tool to remove it. Take note of any signs such as discolored or melted indicating that the relay is stuck or blown. If you discover any faults with the relay, it will need to be replaced.
Solution: Replace the fan control relay
To replace the fan control relay in the Ford F-150, you simply need to buy a new relay with a similar rating to the existing one. Once you have the new relay, carefully place it in the same location as the old one.
Then, start the engine to verify if the noise has been resolved. If the issue persists, it’s possible that there are other factors contributing to the problem. In such cases, proceed to the following steps.
Reason 4: Poorly Covered Fan Motor
If the fan in your Ford F-150 is making a loud noise, it could be because of an improperly covered radiator motor. The noise could happen if the blades are hitting the motor cover. You can ensure that the motor is covered well to prevent this. Even if the fan is new, it could still make noise if the motor cover is the issue.
Diagnosis: Check the Fan Cover Bolts
The radiator motor cover is also known as the shroud cover. Typically there are two bolts of the radiator fan motor cover to fasten the cover properly.
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Check both of the bolts on the shroud cover. If you find the cover isn’t seated on the mounting point or the bolts are not fastened properly you may need to tighten the bolts in a proper torque. In case of improper installment, you need to install it properly.
Solution: Cover The Radiator Motor Correctly
To tighten the Ford F-150 radiator motor cover correctly follow step 7 in replacing the fan blade segment.
Reason 5: Bad Coolant Temperature Sensor
When the coolant temperature sensor is bad in the Ford F-150 it sends an incorrect signal to the engine control module. As a result, it pushes the radiator fan to work harder. As the fan spins at a higher RPM, it makes excessive and noticeable noise.
Diagnosis: Check the Faulty Coolant Temperature Sensor Trouble Code
If the instrument cluster gauge always reads a high/low temperature that means the sensor wrongly reads the temperature. And it’s an indication of a bad coolant temperature sensor.
If you have an OBD, you can also scan the trouble code to know if the coolant temperature sensor is bad in the Ford F-150. The trouble code P0128 on the scanner indicates the coolant temperature sensor issue.
To know how to check the trouble code with an OBD-II scanner, refer to the video below.
If you find the coolant temperature sensor is faulty, it needs to be replaced.
Solution: Replace the Coolant Temperature Sensor
You’ll need the following tools to replace the coolant temperature sensor on the Ford F-150.
Tools needed:
- A socket wrench set
- A new coolant temperature sensor
- A drain pan
- Some coolant
Replacing the Ford F-150 coolant temperature sensor includes the following steps.
Step 1: Locate the thermostat housing
The coolant temperature sensor is located underneath and behind the thermostat housing. There is a small temperature sensor right in the engine that looks like a head temperature sensor. You can find it by going underneath the housing and looking for a hole where it goes by following the hose.
Step 2: Disconnect the electrical connector
Locate the electrical connector connected to the coolant temperature sensor. Gently detach the connector by pressing down on the tab and pulling it away from the sensor. Be careful not to break the connector.
Step 3: Remove the old coolant temperature sensor
Using a socket wrench, loosen and remove the old coolant temperature sensor from the engine. Turn it counterclockwise until it comes loose and then carefully pull it out.
Step 4: Install the new coolant temperature sensor
Take the new coolant temperature sensor and align it with the hole in the engine. Insert it into the hole and rotate it clockwise until it is securely in place. Make sure it is properly seated and snug.
Step 5: Reconnect the electrical connector
Attach the electrical connector to the new coolant temperature sensor. Push it in until it clicks into place, ensuring a secure connection.
Step 9: Erase the trouble code
Lastly, erase the trouble code for the bad coolant temperature sensor that is stored in the memory using an OBD scanner. The following video shows how to erase the trouble code.
That’s it! You’ve successfully replaced the coolant temperature sensor in your Ford F-150.
Reason 6: Loose Or Damaged Fan Blades
If a Ford F150 cooling fan blade is damaged or loose, it can make a loud noise since it is not rotating correctly. As the fan blades spin, they can wobble or vibrate, which creates a loud noise.
The loose or damaged blades can also make contact with other parts of the fan, such as the shroud or the motor, which can create additional noise. During high-speed operation or when the engine is running at high RPMs, the fan can make a loud noise.
Diagnosis: Visually Inspect The Fan Blades
If the fan blades bend away or are damaged they should be clearly visible. To visually inspect if the blades are bent or faulty follow the steps below.
Tools needed:
- 10mm socket and ratchet
- Flat-blade screwdriver
Step 1: Locate the radiator fan
Ford F-150 radiator fan is typically located under the hood behind the radiator near the engine component.
Step 2: Remove the panel
Start by taking off the spare tire jack crank.
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Then, locate the clips on the front cover and remove the screws from them. Next, remove the two clips at the back of the panel using a flat-blade screwdriver.
Carefully remove the clips and the panel.
Step 3: Remove the cover and connectors
Remove the cover by taking off the two 10mm bolts on the side and one on the passenger side using a 10mm socket and ratchet.
Loosen the throttle body clamp using a flat-blade screwdriver and detach the entire ducting. Disconnect the tubes that go on the side.
Step 4: Visually inspect the fan blades
Once you have located the fan, it is important to visually inspect the fan blades to ensure that they are in good condition. To do so, slowly rotate each blade and carefully examine them for any signs of wear and tear or unusual alignment. Additionally, it is recommended to check if the blades are loose by gently shaking them with your hand.
If the fan blades are loose or misaligned, they can be realigned to restore proper functionality. You can do it simply by slowly twisting it with your hand. However, in situations where the fan blades have undergone significant wear and tear, it is advisable to replace them to ensure optimal performance.
Solution: Replace the Fan Blades
Here are the step-by-step instructions to replace the radiator fan blades in Ford F-150:
Tools needed:
- 36mm wrench
- 8mm socket wrench
- 13mm socket wrench
- Fan removal tools
- A pair of pliers
- A torque wrench
- A brand new radiator fan
Step 1: Remove the front cover and locate the fan
To remove the front cover and locate the radiator fan in Ford F-150 follow steps 1 to 3 in the fan blade inspection section.
Step 2: Loosen the radiator hose clamp
Using a pair of pliers, loosen the radiator hose clamp and pull it back. Twist the hose to break it free and remove it.
Step 3: Lift the fan shroud
There is an 8mm bolt on one side of the fan shroud and another in a similar location on the other side. Remove these bolts. Then lift the fan shroud up and out using an 8mm socket with a ratchet and extension.
Step 4: Remove the fan blade
To remove the fan, you will need fan removal tools. Attach the fan removal tool to the bolts that hold the fan.
Next, use a 36mm wrench and a ratchet for additional leverage. Once you break it free, the fan will spin right off. Then remove the fan blade by pulling it with your hand. As you can see in the image below.
Source: A Auto: Repair Tips & Secrets Only Mechanics Know
Step 5: Separate the fan blade from the clutch
There are four 13mm bolts holding the fan clutch to the fan blade. Remove these bolts. The fan blade will be detached from the clutch.
Step 6: Install the new fan blade
Take the new fan blade and place it in the same location as the original one.
Use the four bolts to secure it, tightening them to 15-foot pounds of torque with a torque wrench.
Step 7: Reassemble the components
To reassemble all the parts and components follow the reverse order as you removed them.
With this, you’re done with replacing the radiator fan blades in Ford F-150. In case, if you need a more comprehensive visual guide to replace the fan blade refer to the video below.
However, some of the models of the Ford F-150 have dual-fan radiators. Replacing this type of fan is slightly different from the single-fan radiator. For the guide on the dual-fan replacement process refer to the video below.
Reason 7: Worn Bearing/Clutch
Ford F-150 radiator fans often make loud noises due to faulty bearings. As the bearing wears out, metal particles are released, causing the fan to generate a noticeable and annoying sound. Typically, a whining noise is a clear indication of a defective bearing.
Diagnosis: Examine the Bearing/Clutch
The radiator fan bearing in the Ford F-150 is located on the fan clutch.
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To properly examine the radiator fan bearing, it is necessary to remove the radiator fan panel. You can refer to steps 1 to 3 in the fan blade inspection segment, as well as steps 1 to 4 in the fan blade replacement section for guidance on this procedure.
After locating the fan blade you’ll be able to understand if the bearing is faulty by visually inspecting it. If the bearing is bad you need to replace the whole fan clutch panel.
Solution: Replace the Fan Clutch
The process of replacing the radiator clutch in a Ford F-150 is remarkably similar to replacing the fan blades. Therefore, comply with all the steps outlined in the fan blade replacement procedure except for step 5. Once you have completed step 4, proceed to install a new clutch in the exact location of the previous one. Following this, continue with the remaining steps as previously instructed.
By following these simple steps properly, you’ll be able to replace the clutch successfully. You can also take the assistance of the following video to do this.
Reason 8: Bad A/C Expansion Valve
A bad AC expansion valve in a Ford F-150 can cause a loud noise in the radiator fan. When the expansion valve goes bad, it may fail to regulate the flow of refrigerant properly. This can lead to excessive pressure buildup in the AC system.
The increased pressure can cause the AC compressor to work harder, generating more heat. The excess heat can then transfer to the radiator, making the radiator fan run at higher speeds to cool it down. The increased fan speed can create a loud noise as it spins rapidly.
Diagnosis: Check The Expansion Valve With a Manifold Gauge
Diagnosing the A/C expansion valve in the Ford F-150 can be a complex procedure. Therefore, it is highly recommended to seek the expertise of a qualified automobile mechanic for the accurate diagnosis and repair of this issue.
Nevertheless, if you are determined to tackle it yourself, the video provided below may be a valuable resource, as it offers visual instructions to help you.
Solution: Replace the A/C Expansion Valve
Replacing the Ford F-150’s A/C expansion valve is a complicated process. It takes a high amount of technical knowledge and understanding. So, it’s recommended to contact an automobile mechanic for this. It’ll cost between $267 and $294 where $71 to $90 is the labor charge.
Reason 9: Faulty Thermostat
A faulty thermostat in the Ford F150 causes problems with cooling. It can’t regulate the engine temperature properly. The faulty thermostat can’t detect or maintain the right temperature. So, the fan works hard to make up for this. It spins quickly to cool the engine, creating a loud sound.
Diagnosis: Scan With An OBD Scanner
Here are some of the common symptoms of a faulty thermostat in the Ford F-150.
- Bizarre sounds (rumbling, boiling, knocking) coming from the radiator
- Coolant leakage
- Blown head gasket
- Radiator fan not working properly
- Radiator hoses hot to touch
In case of these symptoms you can check your truck with an OBD scanner. To know how to scan with an OBD scanner refer to the video in check sensor with OBD. The trouble code P0125 indicates the faulty thermostat. This code is not only for the thermostat issue it also indicates the coolant issue as well.
For this reason, the diagnosis process of the thermostat is a complicated process. Because of this, it’s recommended to consult with professional experts. In case of a faulty thermostat, you need to replace it.
Solution: Replace the Thermostat
Replacing the thermostat is quite a difficult and lengthy process. So, it’s better to have it replaced by a professional automobile mechanic. However, if you want to do it on your own, you can refer to the video below for the guideline.
Reason 10: Clogged Radiator
When dirt or debris clogs the radiator in a Ford F-150, it can’t cool the engine effectively. The heat cannot be released efficiently through the hot radiator coolant.
As a result, the engine overheats. To compensate for the reduced cooling, the radiator fan speeds up, resulting in increased noise. You might notice a louder humming, whirring, or buzzing sound as the fan spins faster.
Diagnosis: Inspect The Radiator
To inspect the radiator in the Ford F-150 follow the steps below.
Tools need:
- Socket wrench
- Flatblade screwdriver
Step 1: Locate the radiator
The Ford F-150 radiator is located in front of the radiator fan which can be found under the hood at the front side of the truck. To reach the radiator you need to follow steps 1 to 3 fan blade inspection segment and steps 1 to 4 of the fan blade replacement section.
Step 2: Remove the radiator
After removing the radiator fan the radiator itself will be visible. Pull out the radiator by removing the four bolts that hold it in place by using a socket wrench.
Step 3: Inspect for dirt and debris
Once you’ve removed the radiator, inspect it carefully. If the radiator is clogged that’ll be visible after removing the radiator. In case of a clogged radiator, you need to clean it. However, if the debris is severe, you may need to replace it.
To determine if the radiator is clogged or bad refer to the video below.
Solution: Replace the Radiator
Follow these steps to replace the Ford F-150 radiator.
Tools needed:
- A new radiator
- Socket wrench
- Flat blade screwdriver
Step 1: Remove the old radiator
From locating to removing the radiator in the Ford F-150 follow steps 1 and 2 of the inspecting section.
Step 2: Install the New Radiator
Once you’ve removed the Ford F-150, install the radiator as the old one was. And then reinstall the parts and cover that you’ve removed as they were. To do this, follow steps 7 to 9 of replacing the fan blades section.
Reason 11: Faulty Water Pump
A faulty water pump in a Ford F150 can cause noise in the radiator. When the water pump malfunctions, it may not circulate the coolant properly. This can result in the coolant flowing irregularly through the radiator, creating turbulence and overheating.
To control the engine temperature, it makes the radiator fan work harder. As a result, the fan makes a loud noise. The noise is often described as a rattling or grinding sound, which is a sign that something is wrong with the water pump.
Diagnosis: Examine Other Symptoms For Faulty Water Pump
If the water pump is faulty in the Ford F-150, there will be some notable signs along with the noise. Those signs include-
Engine overheating: If the engine gets too hot in normal conditions, it could be a bad water pump.
Smoke from the engine: Immediate action is needed if you see smoke, as it may indicate a problem with the water pump or coolant system.
Coolant leakage: Watch for green or red fluid under your truck, which could mean a leaking water pump.
False temperature gauge reading: If the temperature gauge shows abnormally high readings, the water pump might be at fault.
In such cases, you may need to replace the water pump. For further diagnosis and the remedy, it’s recommended to contact an automobile mechanic.
Solution: Replace the Water Pump
Replacing the water pump is a complicated procedure. It’s always better to have the water pump issue fixed by an automobile expert. However, if you prefer to do it yourself you can refer to the video tutorial below.
FAQs
What Is The Difference Between Radiator Fan And Cooling Fan?
The radiator fan and cooling fan are often used interchangeably. They both draw heat from the radiator and dissipate it. The cooling fan, also called the radiator fan, is mounted between the radiator and the engine. In front-wheel cars, it’s an electric component powered by the battery.
What Are The 2 Types of Radiator Fans?
The two types of radiator fans are mechanical and electrical radiator fans. The mechanical fan is powered by the engine’s belt system and is typically found in older car models. Meanwhile, the most common radiator cooling fan today is powered by an electric motor and operates independently. There are different sizes, speeds, and configurations of electric radiator fans.
How Do I Reduce The Noise of My Cooling Fan?
Try moving your cooling fan away from any obstacles in front or behind it to reduce its noise. Obstacles on the intake side tend to increase the noise more than those on the exhaust side. You can also consider reducing the revolutions per minute (RPM) of the fan, but keep in mind that this may result in lower airflow as well.
Signing Off
Well, this is the tale of the discussion on why my Ford F-150 fan so loud. Hopefully, this discussion serves your need for remedial information. Remember radiator fans are a crucial aspect of your truck. Driving with a noisy radiator fan can be hazardous for your truck and can cause further damage.
Thank you!
