Dodge Ram 3500 Van Radiator Fan Isn't Working

Diagnosing the Causes of a Non-Functional Radiator Fan in Your Dodge Ram 3500 Van and How to Fix It

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Reviewed by
Aisha
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 Dodge Ram 3500 Van 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 Dodge Ram 3500 Van 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 first indication of a defective fan clutch is a healthy cooling system that runs below or above the normal temperature range. This is due to the fan running too fast or too slow. Also, a seized cooling fan will cause a loud roaring fan noise from under the hood every time the accelerator is pressed, and the engine will feel as if it lacks power. In this situation it would be very difficult to turn the engine cooling fan by hand, of course when the vehicle is off. Finally, if the clutch fails the fan will either turn very slowly, and not respond well to engine speed.

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.

Troubleshooting Radiator Fan Issues in a Dodge Ram 3500 Van

When troubleshooting radiator fan issues in your Dodge Ram 3500 Van, begin by checking the fuse associated with the fan; a blown fuse is a straightforward fix that can often resolve the problem. Next, inspect the wiring for any signs of damage or loose connections, as these can disrupt the fan's operation. If the wiring appears intact, examine the fan assembly itself for any mechanical failures that may require repair or replacement. Additionally, consider the fan clutch, particularly if your model features an electric motor; a malfunctioning fan clutch can hinder the fan's ability to adjust its speed according to engine demands. Another critical component to assess is the coolant temperature sensor, as an inaccurate reading can prevent the fan from activating when necessary. If these checks do not yield results, look for diagnostic trouble codes, such as P0481, which may indicate a control circuit malfunction. Lastly, be mindful of the potential for transmission overheating if the fan is not functioning correctly, especially under heavy towing conditions. By following this methodical approach, you can effectively diagnose and resolve radiator fan issues, ensuring your vehicle operates smoothly.

What to Check When the Radiator Fan Isn't Working in a Dodge Ram 3500 Van?

When troubleshooting a non-functioning radiator fan in your Dodge Ram 3500 Van, it's essential to understand the common problems that could be at play. Start by examining the fan assembly itself, as a malfunction here can prevent the fan from operating effectively. Next, consider the fan clutch; if it's faulty, it may fail to engage, leading to inadequate cooling. The coolant temperature sensor is another critical component to check, as it regulates the fan's operation based on engine temperature. If this sensor is malfunctioning, it may not signal the fan to turn on when needed. Additionally, inspect the wiring connected to the fan for any signs of damage or loose connections, as faulty wiring or a blown fuse can disrupt the fan's functionality. Pay attention to any unusual behavior, such as excessive wobbling or prolonged running times, which could indicate a failing fan clutch. Lastly, remember that electric radiator fans have a finite lifespan and may require replacement over time. By systematically checking these components, you can effectively diagnose and resolve the issue with your radiator fan.

Why is the Radiator Fan Not Working in a Dodge Ram 3500 Van?

When the radiator fan in your Dodge Ram 3500 van fails to operate, it’s crucial to address the issue without delay. Ignoring a malfunctioning fan can lead to severe consequences, such as engine overheating, which not only compromises vehicle performance but can also result in costly repairs. The radiator fan plays a vital role in regulating engine temperature, especially during heavy towing or in hot weather conditions. If the fan is not functioning, the engine may overheat, potentially causing damage to critical components like the transmission or the engine itself. Additionally, electrical issues, such as faulty wiring or a malfunctioning coolant temperature sensor, can exacerbate the problem, leading to further complications. Therefore, it’s essential to conduct a thorough inspection and troubleshoot the fan system promptly to prevent safety risks and ensure the longevity of your vehicle. Taking immediate action can save you from more significant issues down the road, making it a priority for any DIY enthusiast.

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Dodge Ram 3500 Van Radiator Fan Not Working | RepairPal