2016 Yukon Denali Radiator Fan Won’t Turn Off: Troubleshoot & Fix

2016 Yukon Denali Radiator Fan Won'T Turn off

The 2016 Yukon Denali radiator fan won’t turn off, indicating a potential issue with the fan relay or temperature sensor. This malfunction can cause the engine to overheat and result in damage if not addressed promptly.

The 2016 Yukon Denali is known for its powerful engine and luxurious features. However, if you encounter a problem with the radiator fan constantly running, it can be a cause for concern. This issue usually arises due to a malfunctioning fan relay or temperature sensor.

We will explore the potential causes of a radiator fan that won’t turn off and discuss possible solutions to rectify the problem. It is crucial to address this issue promptly to prevent engine damage and ensure the smooth operation of your vehicle.

Table of Contents

Common Causes For Radiator Fan Failure

The 2016 Yukon Denali may experience radiator fan failure, causing the fan to stay on continuously. This issue can be caused by various factors, such as a faulty fan relay, a malfunctioning temperature sensor, or a defective fan motor.

A malfunctioning radiator fan can be a frustrating issue for Yukon Denali owners. It’s important to diagnose the problem quickly to prevent your engine from overheating and causing further damage. Here are some of the common causes for radiator fan failure:

Faulty Temperature Sensor:

  • The temperature sensor measures the coolant temperature and sends signals to the radiator fan to turn on when needed. If the sensor is faulty, it may inaccurately detect the coolant temperature or fail to send the signals. This can result in the radiator fan not turning on when necessary.
  • To troubleshoot this issue, check if the temperature sensor is properly connected and if its wiring is intact. If necessary, replace the sensor to ensure accurate temperature readings.

Malfunctioning Fan Relay:

  • The fan relay is responsible for controlling the flow of electricity to the radiator fan. If the relay becomes faulty, it may not properly send power to the fan, causing it to not turn on or turn off unexpectedly.
  • To check the fan relay, you can perform a simple test by swapping it with a similar relay in your Yukon Denali’s fuse box. If the radiator fan starts working after the swap, you may need to replace the faulty fan relay.

Electrical Wiring Issues:

  • Electrical wiring problems can also cause radiator fan failure. Damaged or disconnected wires can prevent the fan from receiving the required power to operate effectively.
  • Inspect the wires connected to the fan and look for any signs of damage or loose connections. Repairs may involve repairing or replacing damaged wires and ensuring proper connections.

Identifying and addressing the root cause of your Yukon Denali’s radiator fan failure is crucial in order to avoid engine overheating and potential engine damage. By checking and troubleshooting the temperature sensor, fan relay, and electrical wiring, you can effectively resolve the issue and keep your vehicle performing optimally.

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Testing The Temperature Sensor

Experience issues with your 2016 Yukon Denali radiator fan continuously running? Our temperature sensor testing guide delivers effective troubleshooting tips for diagnosing the problem. Discover solutions to ensure your fan operates as intended and keeps your engine cool.

If you’re experiencing an issue with your 2016 Yukon Denali radiator fan not turning off, it’s crucial to test the temperature sensor to determine its functionality. The temperature sensor plays a vital role in regulating the cooling system by measuring the engine’s temperature and signaling the radiator fan when it needs to turn on or off.

Here are the steps to follow when testing the temperature sensor:

Using A Multimeter To Check Sensor Resistance:

  • First, make sure the engine is off and has cooled down before beginning any tests.
  • Locate the temperature sensor, which is usually positioned near the engine block or radiator.
  • Disconnect the electrical connector from the temperature sensor.
  • Set your multimeter to the resistance setting.
  • Attach one probe to the temperature sensor’s terminal and the other probe to a ground source, such as the engine block.
  • Check the resistance reading on your multimeter display. Refer to your vehicle’s service manual for the correct resistance specifications.
  • If the resistance reading falls within the acceptable range, the temperature sensor is functioning correctly. Move on to inspecting for physical damage or corrosion. If the reading is outside the specified range, the temperature sensor may need to be replaced.

Inspecting For Any Physical Damage Or Corrosion:

  • Visually examine the temperature sensor for any signs of physical damage, such as cracks or leaks.
  • Check for corrosion on the sensor’s housing or electrical connector.
  • Corrosion can hinder the sensor’s ability to function properly, so ensure there’s no build-up of rust or debris.
  • If you notice any damage or corrosion, it may be necessary to replace the temperature sensor.

Checking For Loose Or Disconnected Wires:

  • Ensure all wires connected to the temperature sensor are tightly secured and properly connected.
  • Look for any signs of fraying or exposed wires.
  • Check for any loose or disconnected wires that may be causing the issue with the radiator fan.
  • If you find any loose or disconnected wires, secure them properly or reconnect them as necessary.

By following these steps, you can effectively test the temperature sensor on your 2016 Yukon Denali to determine if it’s contributing to the radiator fan not turning off. Remember to exercise caution and consult your vehicle’s service manual for specific instructions and resistance specifications.

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Replacing The Temperature Sensor

Replacing The Temperature Sensor

If your 2016 Yukon Denali radiator fan won’t turn off, it might be due to a faulty temperature sensor. Replacing the temperature sensor can help resolve the issue and ensure that your radiator fan operates correctly.

If your 2016 Yukon Denali radiator fan won’t turn off, it’s likely that the temperature sensor is malfunctioning. The temperature sensor plays a crucial role in detecting the engine temperature and signaling the radiator fan to turn on or off accordingly.

Replacing the temperature sensor might be necessary to resolve this issue. Here is a step-by-step guide on how to replace the temperature sensor and get your radiator fan back in working order.

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Gathering The Necessary Tools And Supplies:

To begin the process of replacing the temperature sensor, gather the following tools and supplies:

  • Socket wrench set
  • Pliers
  • Coolant drain pan
  • New temperature sensor (make sure it is compatible with your Yukon Denali)

Locating And Accessing The Temperature Sensor:

  • Open the hood of your Yukon Denali and locate the temperature sensor. It is usually located near the engine block or the thermostat housing.
  • Carefully disconnect the electrical connector attached to the temperature sensor using pliers if necessary.

Removing The Old Sensor And Installing The New One:

  • Use a socket wrench to loosen and remove the old temperature sensor from its position. Be mindful of any coolant that may leak during this process and have a coolant drain pan ready to catch it.
  • Once the old sensor is removed, take the new temperature sensor and apply a small amount of thread sealant or Teflon tape to the threads. This helps ensure a proper seal and prevent any coolant leaks.
  • Carefully thread the new temperature sensor into its designated position, making sure not to overtighten it.
  • Reconnect the electrical connector to the new temperature sensor, ensuring a secure connection.

Testing The Functionality Of The New Sensor:

  • With the temperature sensor replaced, start the engine and let it run for a few minutes.
  • Monitor the temperature gauge on your dashboard to see if it responds appropriately.
  • Observe the radiator fan to check if it turns on and off according to the engine temperature.
  • If everything seems to be functioning correctly, congratulations! You have successfully replaced the temperature sensor.

By following these steps, you should be able to replace the temperature sensor in your 2016 Yukon Denali and resolve the issue of the radiator fan not turning off. It’s important to ensure the new sensor is compatible and properly installed to avoid any further complications.

If you have any concerns or doubts, it is always recommended to consult a professional mechanic for assistance.

Checking The Fan Relay

To troubleshoot a 2016 Yukon Denali radiator fan that won’t turn off, start by checking the fan relay. Look for any signs of damage or malfunction, and consider replacing it if necessary. The fan relay is an essential component in controlling the radiator fan’s operation, so addressing any issues with it may help resolve the problem.

Identifying The Location Of The Fan Relay

  • The fan relay is an essential component of the cooling system in your Yukon Denali. It controls when the radiator fan turns on and off to regulate the engine temperature. To check the fan relay, you first need to locate it in your vehicle.
  • The fan relay controls when the radiator fan turns on and off to regulate the engine temperature. This product is a suitable replacement and should be compatible with your vehicle.

  • Relays carry high-amperage current controlled by a low-current switch
  • When a faulty relay is not replaced, the circuit will either be non-functional or remain engaged
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  • The fan relay is typically housed in the engine compartment fuse box or the underhood electrical center. Refer to your vehicle’s owner’s manual or consult with a professional mechanic to find the exact location of the relay.
  • Once you have identified the fuse box or electrical center, visually inspect the lid or the inside cover for a diagram or label that indicates the location of the fan relay. This will help you locate it more easily.

Inspecting The Relay For Any Visible Damage

  • Before testing the fan relay, it is important to inspect it for any visible signs of damage. Look for any signs of burning, melting, or loose connections on the relay and its surrounding components.
  • Carefully remove the relay from its socket, if possible, and examine the pins and connectors for corrosion or debris. Clean any dirt or grime that may be obstructing the connections using a soft brush or compressed air.
  • A reliable digital multimeter is essential for testing the continuity and resistance of the fan relay. This versatile tool can be used for various electrical diagnostics.
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  • Inspect the relay’s casing for cracks or discoloration, as these may indicate internal damage. If you notice any severe damage or signs of wear, it is likely that the relay needs to be replaced.

Testing The Relay Using A Multimeter

  • To determine if the fan relay is functioning properly, you can use a multimeter to test its continuity and resistance. This will help you determine if the relay is providing the necessary electrical connection.
  • Set the multimeter to the appropriate setting for testing continuity or resistance. Typically, the continuity setting is represented by the soundwave symbol (∿) and the resistance setting by the ohm symbol (Ω).
  • Place the multimeter’s probes on the corresponding relay pins or connectors as indicated in the relay’s wiring diagram or the vehicle’s service manual. Ensure a secure and clean connection to obtain accurate readings.
  • With the multimeter connected, activate the radiator fan by turning on the ignition or allowing the engine to reach operating temperature. Observe the multimeter readings for continuity or resistance. If the readings are outside the specified range or there is no continuity, it is likely that the relay is faulty.

Replacing The Relay If Necessary

  • If the fan relay shows signs of damage or fails the multimeter test, it is recommended to replace it with a new one. A malfunctioning relay can lead to overheating issues and potential damage to your vehicle’s engine.
  • Purchase a replacement relay that matches the specifications of the original relay. Look for the same part number or consult with a professional to ensure compatibility.
  • Carefully remove the old relay from its socket, noting its orientation and the position of each pin. Install the new relay by aligning the pins with their corresponding slots in the socket and pushing it firmly into place.
  • After replacing the relay, perform another test to verify that the radiator fan now turns off properly. If the issue persists, it may indicate a different problem that requires further inspection or professional assistance.

Inspecting And Repairing Electrical Wiring

Inspecting and repairing electrical wiring is crucial when dealing with issues like a 2016 Yukon Denali radiator fan that won’t turn off. With expert knowledge and attention to detail, professionals can diagnose the problem and provide efficient solutions for a fully functional fan system.

2016 Yukon Denali Radiator Fan Won’T Turn Off

Is your 2016 Yukon Denali experiencing an issue where the radiator fan won’t turn off? This can cause overheating and potential damage to your vehicle’s engine. One possible cause of this problem is loose or damaged electrical wiring. In this section, we will explore how to inspect and repair the electrical wiring to resolve this issue.

Checking For Loose Or Damaged Wires:

To diagnose the issue with your radiator fan, you should start by checking for any loose or damaged wires. Here’s what you can do:

  • Inspect the wiring harness connected to the radiator fan for any signs of wear or damage.
  • Look for loose connections between the wiring harness and the fan motor.
  • Ensure that the wires are securely connected to their respective terminals.

Repairing or Replacing Any Damaged Wires:

Once you have identified any loose or damaged wires, it is crucial to repair or replace them to restore proper functionality. Here are the steps you can take:

  • Carefully strip off the damaged portion of the wire using wire cutters/strippers.
  • Install a new connector or terminal to ensure a secure connection.
  • Use heat shrink tubing or electrical tape to insulate the repaired portion.

Ensuring Proper Connection and Insulation:

To avoid future issues with your radiator fan, it is essential to ensure proper connection and insulation of the electrical wiring. Follow these guidelines:

  • Double-check all connections to ensure they are tightly secured.
  • Inspect the wire insulation for any signs of wear or damage and replace as necessary.
  • Use zip ties or routing clips to secure the wiring harness away from any heat sources or moving parts.

By thoroughly inspecting and repairing any loose or damaged electrical wiring, you can resolve the issue of your 2016 Yukon Denali radiator fan not turning off. Remember to follow the proper steps and take necessary precautions to ensure a successful repair.

Verifying Fan Operation

If your 2016 Yukon Denali radiator fan won’t turn off, it is crucial to verify fan operation. Ensure the fan is functioning correctly to prevent overheating and potential engine damage.

Starting The Vehicle And Monitoring The Fan Operation

When faced with a radiator fan that won’t turn off on your 2016 Yukon Denali, it’s essential to verify its operation thoroughly. A OBD2 Scanner can help you in that case.

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Here’s a step-by-step guide to help you diagnose the issue:

  • Start the vehicle by turning on your Yukon Denali and letting it idle for a few minutes. This will allow the engine to warm up, triggering the fan to activate.
  • Observe the fan: While the engine is running, keep a close eye on the radiator fan. Take note of its behavior and whether it remains running indefinitely or shuts off after a certain period.
  • Check for temperature fluctuations: Pay attention to any fluctuations in the engine’s temperature gauge. If the temperature rises significantly and the fan fails to activate, it could indicate a separate problem.
  • Monitor the fan’s duration: If the fan continues to run after the engine has reached the desired operating temperature or if it remains active for an extended period, it may indicate an underlying issue that requires attention.
  • Listen for abnormal noises: While the fan is running, listen for any unusual sounds such as grinding, squealing, or rattling. Abnormal noises could suggest a mechanical problem with the fan assembly.

Analyzing Any Remaining Issues And Further Troubleshooting

Once you have completed the initial verification process, and if the fan continues to run abnormally, it’s time to move on to further troubleshooting. Here are some additional steps you can take to analyze the issue:

  • Inspect the fan relay: Locate the fan relay in your vehicle’s fuse box. Check for any signs of damage, such as burnt or melted components. Replace the relay if necessary.
  • Test the fan control module: Use a multimeter to check the voltage on the fan control module. Ensure that it is receiving the correct signals and functioning properly. Replace if needed.
  • Check the coolant temperature sensor: The coolant temperature sensor provides input to the cooling system, including the fan operation. Inspect the sensor and replace it if it’s faulty.
  • Examine the wiring and connectors: Inspect the wiring harness and connectors related to the radiator fan. Look for any loose connections, frayed wires, or signs of damage. Repair or replace as required.
  • Consult a professional: If you’ve followed these steps and still can’t identify the issue, consider seeking assistance from a qualified mechanic or an authorized dealership. They have the necessary expertise to troubleshoot complex cooling system problems.

Remember, addressing an overheating engine promptly is crucial to prevent further damage. By carefully verifying the fan operation and performing additional troubleshooting steps, you increase your chances of resolving the issue and getting your 2016 Yukon Denali back on the road in no time.

Additional Considerations

The 2016 Yukon Denali radiator fan not turning off may require additional considerations for repair. Ensure proper diagnosis and inspection to identify the underlying cause and resolve the issue promptly.

Radiator fan issues can be frustrating to deal with, especially when it won’t turn off. If you’ve already tried troubleshooting steps without success, there are additional considerations to keep in mind. By consulting the vehicle’s manual or seeking professional help, you can ensure the problem is properly addressed.

Regular maintenance and inspections are also crucial to prevent future issues with the radiator fan. Here are some important points to consider:

Consulting The Vehicle’S Manual Or Seeking Professional Help If Troubleshooting Steps Are Unsuccessful:

  • Refer to the vehicle’s manual for specific instructions on troubleshooting the radiator fan issue.
  • If you’re not comfortable troubleshooting on your own or the problem persists, it’s best to seek professional assistance.
  • A qualified mechanic or dealership can diagnose the problem accurately and provide the necessary repairs or replacements.
  • They have the expertise and proper tools to handle complex issues related to the radiator fan.

Regular Maintenance And Inspections To Prevent Future Issues With The Radiator Fan:

  • Schedule regular maintenance checks to keep the radiator fan in optimal condition.
  • Routine inspections can help identify any potential problems early on and prevent them from escalating.
  • Check for any signs of damage, such as frayed wiring or loose connections, during inspections.
  • Ensure that the fan blades are clean and free from debris that could obstruct smooth operation.
  • Regularly clean the radiator fins to prevent dirt and dust build-up, which can affect the fan’s efficiency.
  • Monitor the coolant level and quality to avoid overheating, which can put unnecessary strain on the radiator fan.

By following these additional considerations, you can address the issue effectively and prevent future problems with your Yukon Denali’s radiator fan. Remember, consulting the vehicle’s manual or seeking professional help is always a wise decision when troubleshooting steps prove unsuccessful.

Additionally, prioritizing regular maintenance and inspections will contribute to the long-term health of your radiator fan.

Frequently Asked Questions For 2016 Yukon Denali Radiator Fan Won’T Turn Off

Why Is My Radiator Fan Not Shutting Off?

Your radiator fan may not be shutting off because of a faulty thermostat or a problem with the fan relay.

Why Does My Radiator Fan Stay On When My Car Is Off?

The radiator fan may stay on after the car is turned off due to engine temperature regulation.

Why Is My Radiator Fan Running All The Time?

The radiator fan may run all the time due to issues with the thermostat or a malfunctioning fan relay. Check these components to resolve the issue.

Can A Bad Thermostat Cause Fan To Stay On?

Yes, a faulty thermostat can cause the fan to stay on due to incorrect temperature readings.


To wrap up, dealing with a radiator fan that won’t turn off in your 2016 Yukon Denali can be a frustrating and concerning situation. There are several potential causes, ranging from a faulty fan relay switch to a malfunctioning temperature sensor.

It’s crucial to address the issue promptly to prevent further damage to your vehicle’s cooling system. Start by checking the fan relay switch and temperature sensor for any signs of damage or malfunction. If necessary, consult a professional mechanic who can accurately diagnose and fix the problem.

Regular maintenance and keeping an eye on your vehicle’s temperature gauge can help prevent such issues from occurring in the future. By taking action promptly and seeking professional help if needed, you can ensure a functioning radiator fan and a smooth driving experience in your 2016 Yukon Denali.

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