Why Is My Ford F150 Fan So Loud (or Stays On)?

Why is my f150 fan so loud

You tend to notice it most when stuck at traffic, or perhaps when trying to hear what your passenger is screaming at you… yep, it’s that loud F150 fan. It’s a common enough issue, and plenty of owners are reporting it. But just why is your F150 fan so loud? Well, here’s the lowdown… plus what to do if your fan keeps running and doesn’t shut off.

Why is my ford f150 fan so loud? Your F150 fan could be loud due to reasons including low coolant (AC refrigerant) levels, stuck fan control relay, bad temperature sensor, blockage in the AC, or a defective fan. 

In most cases your F150 fan is loud because of noises coming from cooler relays or the fan assembly. But that might not always be the case, so read on to see more details and possible ideas on what you could do to stop the loud fan noises.  

Why is my f150 fan so loud: common causes in detail           

1. The AC system

The F150’s air conditioner being faulty is one the most common reasons why your cooling fan is so loud as it will need to work harder. Examples include the following: 

  • There could be a leak in the refrigerant.
  • The coolant could be low – it should be changed every two years.
  • Your condenser might be blocked or clogged.
  • Worst case a broken condenser.
  • Electrical issues in the truck.
  • The cooling fan might be broken.
  • Bad AC compressor.

2. Fault in radiator’s fan belt

If your radiator fan is broken or its belt is loose, then this might cause loud noise from the cooling fan because your engine is overheating. It will need to work harder to cool your engine down as the cooling fan tries hard to overcome heat, causing loud noises.

3. Faulty temperature sensors

When the car radiator cooling fan keeps running constantly because of outside temperature or failing of coolant temperature sensor or its wiring, broken fans, damaged electrical wires, electronic engine control unit (ECU) problems.

4. Your physical location

Where you live can also impact how loud your Ford F150 fan is. Radiator cooling fans are designed to keep your truck cool and running smoothly. But if you’re in a hot climate, and with rising temperatures, your engine will struggle to keep up. 

As it works harder, you experience a loud F150 cooling fan. It’s not just about cooling you down anymore-it have increased efficiency so much that there are noises coming from inside of it!

5. Your driving style

Driving can be measured by acceleration time with the accelerometer or GNSS (GPS). These methods give you accurate and reliable data to detect harsh braking and quick acceleration. 

Both are responsible for your truck to overheat and putting the workload on cooling fans.

How to stop the loud noise coming from your F150 fan

F150 cooling fans can suddenly start making noises the moment you turn on the ignition. Here are some additional ways to fix the issue aside from the obvious ones already recommended.

Fix AC blockages 

When the AC is blocked, pressure will build up in the AC system. This change to high pressure will mean the cooling radiator fans will spin at a quicker rate as they are getting a false signal. 

This could be due to a pack of silica in the system that has come apart, meaning those small particles are blocking the lines. This leads to the high pressure, false signals, and overheating which makes the fans work overtime and get really loud. 

Your dealer can clean the system and then re-charge it. But the problem can re-appear down the line. 

Install a larger fan and run it at a lower speed

It’s no secret the fan can be the largest source of engine noise in an application. The faster it’s turned, the louder it is. So, if there’s room for a larger fan which by itself can facilitate more airflow. 

Now this is where the latest technology came in, you can spec it into your engine design and spin it at fewer RPMs

Getting modified and new software for temperature sensors

Using the latest engine cooling technology is so advanced and getting more accurate day by day. The variable-speed drive delivers cooling only when needed, and only as much as is needed. By using a pulse-width modulation signal derived via the inputs from the engine’s ECU. This signal actuates an internal valve, controlling the clutch, and allowing more precise cooling for systems such as the hydraulic oil circuit, air conditioning unit, and of course, the engine coolant.

When cooling is optimized, the fan doesn’t spin any faster than needed, and only operates at top speed when necessary – thus resulting in lower decibel levels.

Choose a fan designed to produce less noise

This is where the different customization options for engine cooling fans can come in handy. They might be expensive, and this method is only used when you know there is no other way to fix a fan. 

Engineers can manipulate how much airflow passes through to the engine. The right balance of cooling ensures under-hood components stay safe from temperature swings – all while eliminating unnecessary noise.

Handy Hint: Does your F150 sound like a diesel? Read the full blog post to find out why and what you can do to fix it.

Why does my F150 fan stay on?

The next common problem is where your F150 fan stays on all the time.

If your air con has a leak or is low on coolant, the high-pressure switch won’t turn off the compressor. This will then make F150 fans run all the time. 

It could also signal a problem with the F150 cooling fan relay. If the relay shorts, it can result in the power being permanently switched on. And… yes, you’ve guessed it, that means the F150 fan keeps running all the time. This can also lead to a battery drain. 

Why does my Ford F150 fan keeps running when it’s off?

It is normal for a fan to keep on running even if your truck is off because it’s still heated. To keep the engine calm and avoid overheating, which could suck your engine oil. A fan must keep on running to avoid the aftereffects of a long journey or a hot summer day. 

What causes a roaring noise when driving?

Roaring noises probably occur when you have a leak or crack in exhaust pipes or the system’s manifold. If your muffler is damaged the roaring noises, it filters would be audible now. All the waves and vibrations from the muffler will now travel inside your car’s exhaust system and these cause roar sounds.

Why does my truck sound like a fan when I accelerate?

Fan noise is due to loose or worn-out belts. When one of the pulleys of the belt fails to start, the belt makes noises. When pulleys are not smooth enough it also causes a fan-like sound when accelerated. 

Handy Hint: If you feel a jerking in your F150 when you accelerate then it’s something very different.


Do you have to turn your truck off to order at a drive-through? Can your neighbor hear you from 5 blocks away? The insanely loud cooling fan noise is a common problem for F150 owners. 

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Josh Henderson

Hi I'm Josh and I'm a huge pickup enthusiast. I started this website in 2018 in order to share all my projects and custom mod tips that I've done with my own Ford F-150.

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