2019 Ford Mustang Radiator Fan Isn't Working

Diagnosing the Causes of a Non-Functioning Radiator Fan in Your 2019 Ford Mustang and How to Fix It

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
34% chance it's the
Fan Motor or Clutch
0%
28% chance it's the
Fan Relay or Fuse
0%
23% chance it's the
Temp Sensor or Fan Control Module
0%
15% chance it's
Something else
The most common reasons a 2019 Ford Mustang radiator fan isn't working are the fan assembly, the fan clutch, or the coolant temperature sensor.
  • Fan Motor or Clutch: A faulty fan motor or a malfunctioning fan clutch can result in inadequate cooling, causing the engine to overheat.
  • Fan Relay or Fuse: A faulty fan relay or blown fuse can prevent the cooling fan from operating, leading to engine overheating.
  • Temp Sensor or Fan Control Module: A faulty temperature sensor or fan control module can result in incorrect readings, causing the engine to overheat or the cooling fan to operate improperly.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2019 Ford Mustang radiator fan isn't working?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Over time serpentine belts stretch, crack, and the ribs that ride on the accessory pulleys being to wear smooth. A squealing noise that increases with engine speed or as engine driven accessories are turned on may be noted. The noise is caused by the belt slipping on the pulleys, insufficiently driving them. Ineffective air conditioning, a battery warning light, or intermittent power steering assist can result from this.

»MORE: Symptoms of a bad serpentine belt

The bad thermostat can cause two different sets of problems, depending on whether it's stuck open or stuck closed.

A thermostat that is stuck open can cause the engine to run colder than normal and turn on the check engine light. It may also cause poor fuel mileage and the heater to blow cool air.

A thermostat that is stuck closed will cause the vehicle to overheat. If a new thermostat doesn't resolve engine temperature problems, the cooling system needs to be checked for other issues.

» LEARN MORE: Signs of a bad thermostat, and how to fix it

When the radiator fans stop functioning properly, the engine temperature will rise. The spike in temperature will be highest when the vehicle is idling at a stop, but should subside once the vehicle begins moving again.

Additionally, the air conditioner typically won't blow as cold. This is because the air from the radiator fans also blows across the air conditioning condenser, so when the fans fail, both systems suffer.

You'll also usually see the check engine light and notice a drop in fuel economy. It's possible the fan will start making noise if it's failing, as well.

What steps should I take to diagnose the non-functioning radiator fan in my 2019 Ford Mustang?

To effectively diagnose a non-functioning radiator fan in your 2019 Ford Mustang, begin with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Start by inspecting the fuse associated with the radiator fan; a blown fuse is a common and easily fixable issue that can halt fan operation. If the fuse is intact, proceed to examine the relay, which controls the power supply to the fan. Testing or replacing a faulty relay can often resolve the problem. Next, test the fan motor directly by applying power to it; if it fails to operate, the motor may need replacement. Additionally, check the temperature sensor, as it plays a crucial role in signaling the fan to activate when the engine reaches a specific temperature. Don’t overlook the wiring; inspect for any damage or loose connections that could disrupt power flow to the fan. Finally, using an OBD-II scanner to check for diagnostic trouble codes can provide valuable insights into any underlying issues with the cooling system. By following this structured diagnostic approach, you can efficiently identify and address the cause of your radiator fan's malfunction.

What are the common problems that could cause the radiator fan to stop working in a 2019 Ford Mustang?

When diagnosing why the radiator fan in a 2019 Ford Mustang has stopped working, it's crucial to consider several common problems that could be at play. A faulty fan motor is often the primary suspect, as it can fail to spin, leading to engine overheating. Additionally, a blown fuse in the fan circuit can interrupt the power supply, rendering the fan inoperative. Another potential issue is a defective relay, which controls the power to the fan; if this component malfunctions, the fan may not activate when needed. Inspecting the fan blades is also important, as any damage can hinder air circulation, exacerbating overheating concerns. Furthermore, a malfunctioning coolant temperature sensor may fail to signal the fan to turn on at the right temperature, while wiring issues can disrupt the electrical connection, preventing the fan from receiving power. Addressing these problems promptly is essential for maintaining optimal engine cooling and preventing costly damage.

How urgent is it to repair the non-functioning radiator fan in a 2019 Ford Mustang to prevent engine overheating?

When considering the urgency of repairing a non-functioning radiator fan in a 2019 Ford Mustang, it is essential to recognize the critical role this component plays in engine health. The radiator fan is responsible for regulating the engine's temperature by dissipating heat, and any malfunction can lead to severe overheating. This overheating not only risks immediate engine performance but can also result in catastrophic damage, such as blown head gaskets or damaged pistons, which are costly to repair. Additionally, prolonged neglect of a faulty radiator fan can lead to the breakdown of essential fluids like engine oil and coolant, compounding the problem and increasing the likelihood of engine failure. Therefore, addressing the radiator fan issue promptly is not just a matter of convenience; it is a necessary step to ensure the safety and longevity of your vehicle. Prioritizing this repair can save you from significant financial burdens and ensure your Mustang operates smoothly.

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