2018 Hyundai Elantra Radiator Fan Isn't Working

Radiator fan not working in 2018 Hyundai Elantra: causes and solutions

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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 2018 Hyundai Elantra 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 2018 Hyundai Elantra 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 initial diagnostic steps to take when the radiator fan isn't working on a 2018 Hyundai Elantra?

When faced with a non-functioning radiator fan in your 2018 Hyundai Elantra, it's essential to adopt a systematic diagnostic approach. Begin by checking the fuse associated with the radiator fan; a blown fuse is a common and easily fixable issue that can halt fan operation. Next, inspect the relay, as it is responsible for supplying power to the fan; a malfunctioning relay can disrupt this flow. If these components are intact, proceed to test the fan motor itself by applying direct power to see if it activates, which will help determine if the motor is faulty. Additionally, the temperature sensor should be evaluated, as it plays a critical role in signaling the fan to turn on when needed. Lastly, don’t overlook the wiring and connections; ensure there are no loose or damaged wires that could impede power delivery. By following these steps, you can effectively diagnose the radiator fan issue and take the necessary actions to restore functionality.

What are the common causes for the radiator fan not working in a 2018 Hyundai Elantra?

When dealing with a non-functioning radiator fan in a 2018 Hyundai Elantra, it's essential to understand the common problems that could be at play. One of the primary culprits is a faulty fan motor, which may require replacement to restore functionality. Additionally, a blown fuse in the fan circuit can disrupt power, so checking for any blown fuses is a crucial step in your troubleshooting process. Another potential issue is a malfunctioning temperature sensor, which may fail to signal the fan to activate when the engine reaches a certain temperature; replacing this sensor can often resolve the problem. Wiring issues, such as damaged or loose connections, can also prevent the fan from operating correctly, making it important to inspect the wiring thoroughly. Lastly, ensure that the coolant level is adequate, as low coolant can lead to overheating and affect the fan's performance. By systematically addressing these common causes, you can effectively diagnose and potentially fix the radiator fan issue in your vehicle.

How urgent is it to repair the non-functioning radiator fan in a 2018 Hyundai Elantra to prevent engine overheating?

When it comes to the non-functioning radiator fan in a 2018 Hyundai Elantra, the urgency of repair cannot be overstated. The radiator fan is essential for regulating the engine's temperature by dissipating heat generated during operation. If this component fails, the engine may not receive the necessary cooling, significantly increasing the risk of overheating. This overheating can lead to severe damage, including warped cylinder heads and blown head gaskets, which can result in costly repairs and even complete engine failure if left unaddressed. Therefore, it is crucial to prioritize the repair of a malfunctioning radiator fan to safeguard the engine's health and ensure the vehicle operates efficiently. Taking prompt action not only prevents immediate overheating issues but also extends the longevity of your engine, making it a wise investment in your vehicle's maintenance.

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