2023 Lexus NX350 Radiator Fan Isn't Working

Troubleshooting the Non-Functioning Radiator Fan in Your 2023 Lexus NX350: 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 2023 Lexus NX350 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 2023 Lexus NX350 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

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 2023 Lexus NX350?

When faced with a non-functioning radiator fan in your 2023 Lexus NX350, it's essential to adopt a systematic diagnostic approach. Begin by checking the fuse associated with the radiator fan, as a blown fuse is a common and easily rectifiable issue. If the fuse is intact, proceed to inspect the relay that controls the fan; a malfunctioning relay can disrupt the power supply to the fan. Next, examine the fan motor itself to ensure it is operational, as a defective motor will prevent the fan from spinning. Additionally, inspect the fan blades for any obstructions or damage that could hinder their movement. It's also crucial to check the coolant level in the radiator, as low coolant can lead to overheating and affect fan performance. Finally, if the problem persists, consider using a diagnostic scanner to identify any error codes related to the cooling system, which can provide further insights into the issue. By following these steps, you can effectively troubleshoot the radiator fan problem and take the necessary actions to restore its functionality.

What are the common problems that could cause the radiator fan to stop working in a 2023 Lexus NX350?

When diagnosing why the radiator fan in a 2023 Lexus NX350 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 overheating. Additionally, a blown fuse in the fan circuit can cut off power, rendering the fan inoperative. Another potential issue is a broken or slipping fan belt, which can hinder the fan's ability to cool the radiator effectively. Temperature sensor malfunctions may also prevent the fan from receiving the necessary signals to activate, while faulty relays can disrupt the electrical current needed for the fan to function. Addressing these issues promptly is vital to avoid engine overheating and damage, making regular maintenance and inspections essential for vehicle health. By understanding these common problems, DIYers can take proactive steps to troubleshoot and resolve radiator fan issues in their Lexus NX350.

How urgent is it to repair the non-working radiator fan in a 2023 Lexus NX350?

When it comes to the non-working radiator fan in your 2023 Lexus NX350, the urgency of repair cannot be overstated. The radiator fan is essential for regulating the engine's temperature, and a malfunctioning fan can lead to severe overheating, particularly in stop-and-go traffic or during hot weather. This overheating can cause significant engine damage, including the failure of critical components like the head gasket, which can result in costly repairs. Additionally, a non-functioning fan can negatively impact your vehicle's overall performance, leading to decreased fuel efficiency and increased emissions. Therefore, it is crucial to address this issue promptly. If you notice any signs of a malfunctioning radiator fan, such as unusual engine temperatures or strange noises, it is advisable to diagnose and repair the problem as soon as possible, either through a DIY approach or by consulting a qualified mechanic. Prioritizing this repair will help ensure the longevity and reliability of your vehicle, safeguarding against potential safety risks and extensive damage.

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2023 Lexus NX350 Radiator Fan Not Working: Causes & Repairs