2006 Ford Mustang Radiator Fan Isn't Working

Diagnosing the Causes of a Non-Functioning Radiator Fan in Your 2006 Ford Mustang and How to Fix It

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Reviewed by
Andrew Hajjar
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 2006 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 cause the engine cooling fan to operate improperly, leading to overheating or inadequate engine cooling.
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 2006 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 engine coolant temperature sensor fails, it will send inaccurate information to the vehicle’s computer, causing the computer to react to false operating conditions. This will cause the engine to consume more fuel than normal, depleting fuel mileage, and causing black, sooty smoke from the engine under moderate to heavy acceleration. The check engine light will illuminate, and on-board diagnostic trouble codes may be stored for exhaust and emission system failure, fuel delivery system failure, and engine cooling system failure. Overheating may also occur, as the coolant sensor may be leaking fluid out of the engine, creating a an air pocket in the system.

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 are the steps to diagnose a non-working radiator fan in a 2006 Ford Mustang?

To effectively diagnose a non-working radiator fan in a 2006 Ford Mustang, start with the simplest checks before progressing to more intricate components. Begin by inspecting the fuse associated with the radiator fan; a blown fuse is an easy fix but may indicate underlying wiring issues if it blows again. Next, test the fan motor directly by connecting it to the battery to ensure it operates at both speeds, which will help confirm whether the motor itself is functional. Following this, examine the wiring harness for any visible damage, as compromised wiring can disrupt the fan's operation. Don’t overlook the fan relay; a malfunctioning relay can prevent the fan from activating when needed, so check its functionality as well. Additionally, verify the temperature sensor, as a faulty sensor may fail to signal the fan to turn on. If all these components check out, consider the fan control module, which regulates the fan's operation and could be a point of failure. Lastly, if the fan still does not work, inspect the radiator fan assembly itself for any defects. Remember to test the fan operation with the air conditioning on, as it may only activate under certain conditions. By following this structured approach, you can systematically identify and resolve the issue with your radiator fan.

What causes the radiator fan to fail in a 2006 Ford Mustang?

Understanding the common problems that can cause the radiator fan to fail in a 2006 Ford Mustang is essential for any DIY mechanic looking to troubleshoot cooling system issues. One prevalent cause is a short circuit within the fan circuit, which can lead to excessive current that damages the fan's wiring or the relay's coil. Additionally, burned out contacts or a faulty relay can prevent the fan from operating, often resulting from the same excessive current. It's also important to consider the fan motor or clutch, as these components can fail and disrupt the fan's functionality. A blown fuse is another simple yet critical issue to check, as it can completely stop the fan from turning on. Overheating can also play a role, particularly if the fan does not engage at the correct speeds. Electrical issues, such as voltage fluctuations when the fan activates, can further complicate matters. Lastly, the vehicle's A/C settings can influence fan operation; if the A/C is off, the fan may not engage, risking overheating. By being aware of these potential problems, DIY enthusiasts can more effectively diagnose and repair radiator fan issues in their Mustang, ensuring optimal engine cooling and performance.

How urgent is it to fix the radiator fan in a 2006 Ford Mustang to prevent overheating?

Fixing the radiator fan in a 2006 Ford Mustang is an urgent matter that should not be overlooked. The radiator fan is essential for maintaining optimal engine temperature by cooling the radiator, and any malfunction can lead to severe overheating. If the fan fails, the engine may overheat, resulting in costly repairs such as warped cylinder heads or blown head gaskets. Additionally, a faulty fan can strain other components of the cooling system, increasing the risk of a breakdown and further damage. In extreme cases, neglecting this issue could culminate in complete engine failure, leaving you stranded and facing significant repair bills. Therefore, it is crucial to inspect and repair the radiator fan promptly to ensure the longevity and reliability of your vehicle.

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2006 Ford Mustang Radiator Fan Not Working