2020 Mazda MX-5 Miata Radiator Fan Isn't Working

Fix Non-Functioning Radiator Fan in 2020 Mazda MX-5 Miata

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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 2020 Mazda MX-5 Miata 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 2020 Mazda MX-5 Miata 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 steps should I take to diagnose the non-functioning radiator fan in my 2020 Mazda MX-5 Miata?

To effectively diagnose a non-functioning radiator fan in your 2020 Mazda MX-5 Miata, it’s essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the fuse linked to the radiator fan, as a blown fuse is a common issue that can easily disrupt fan operation. If the fuse is intact, the next step is to examine the relay responsible for controlling the fan; a malfunctioning relay can prevent the fan from receiving the necessary power to operate. Following this, test the fan motor directly by applying power to it; if the motor does not respond, it may require replacement. Additionally, assess the temperature sensor, which plays a critical role in signaling the fan to activate based on engine temperature; any malfunction here can hinder the fan's performance. It’s also important to check all wiring and connections for security and damage, as faulty wiring can significantly impact functionality. Finally, ensure that coolant levels are adequate, as low coolant can lead to overheating and affect the fan's operation. By following this logical sequence, you can effectively pinpoint and resolve the issue with your radiator fan.

What are the common causes for the radiator fan not working in a 2020 Mazda MX-5 Miata?

When troubleshooting a non-functioning radiator fan in a 2020 Mazda MX-5 Miata, it's essential to consider several common problems that could be at play. A faulty fan motor is often the primary suspect; if the motor fails, the fan will not operate, leading to overheating issues. Additionally, a blown fuse can interrupt the power supply to the fan, rendering it inoperative. It's also crucial to check the temperature sensor, as a malfunctioning sensor may fail to signal the fan to activate when necessary. Wiring issues, such as damaged or corroded connections, can further complicate matters by preventing electrical flow to the fan. Lastly, ensure that the coolant level is adequate, as low coolant can inhibit the fan's operation. By systematically examining these areas, you can identify the root cause of the radiator fan's failure and take the appropriate steps to fix it.

How urgent is it to repair the non-functioning radiator fan in a 2020 Mazda MX-5 Miata?

When it comes to the radiator fan in your 2020 Mazda MX-5 Miata, understanding the urgency of repair is crucial for maintaining your vehicle's health. The radiator fan is essential for regulating the engine's temperature; without it functioning properly, your engine is at risk of overheating. This overheating can lead to severe consequences, such as warping engine components or even complete engine failure, which can be both costly and time-consuming to fix. Additionally, neglecting a faulty radiator fan can strain other parts of the cooling system, compounding the problem and potentially leading to further damage. For DIY enthusiasts, addressing this issue promptly not only safeguards your engine but also ensures a smoother driving experience. Therefore, if you notice any signs of a malfunctioning radiator fan, it is imperative to take action immediately to prevent more significant repairs down the line.

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