Ram 1500 Radiator Fan Isn't Working

Diagnosing the Causes of a Non-Functional Radiator Fan in Your Ram 1500 and How to Fix It

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Reviewed by
Devin Cabugcal
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 Ram 1500 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 Ram 1500 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.

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.

Troubleshooting Radiator Fan Issues in a Ram 1500

When troubleshooting radiator fan issues in your Ram 1500, begin by observing the fan's behavior under different conditions. Pay attention to any unusual noises or changes in the fan's operation, especially when the air conditioning is activated. If the fan fails to engage at critical temperatures, such as when the coolant reaches 230 degrees Fahrenheit, this could indicate a malfunction. Utilize an OBD-II scanner to check for diagnostic trouble codes like P0481, which can point to problems within the cooling fan control circuit. Regular maintenance is crucial; ensure that the fan motor is in good condition, as electric motors have a finite lifespan. If your vehicle uses an oil-filled fan clutch, verify that it is functioning correctly to maintain the appropriate fan speed relative to engine speed. By systematically assessing these elements, you can effectively identify and resolve radiator fan issues, ensuring your Ram 1500 remains in optimal running condition.

How to Diagnose and Fix a Non-Working Radiator Fan in a Ram 1500?

When tackling the issue of a non-working radiator fan in your Ram 1500, it's essential to understand the common problems that can arise. One frequent culprit is a faulty temperature sensor, which can prevent the fan from activating when needed. Additionally, issues with the fan motor itself, such as wear and tear or electrical failures, can lead to complete fan failure. It's also important to consider the electrical system; loose connections or blown fuses can disrupt power to the fan. Unusual noises or erratic fan behavior, especially when the air conditioning is engaged, may indicate problems with the fan clutch, which can either be oil-filled or electric. Regular maintenance checks can help identify these issues early, allowing you to monitor fan performance under different driving conditions. By being aware of these common problems, you can more effectively diagnose and address the root cause of your radiator fan's malfunction, ensuring your vehicle runs smoothly and avoids overheating.

Why is the Radiator Fan Not Working in a Ram 1500?

When the radiator fan in your Ram 1500 is not functioning, it is crucial to act quickly to avoid serious engine overheating, which can lead to costly repairs and safety hazards. Common culprits for a malfunctioning fan include the fan assembly, fan clutch, and coolant temperature sensor. Begin your troubleshooting by checking the coolant level and inspecting the fuses, as these are often simple fixes that can resolve the issue. If the fan fails to operate even when the engine temperature rises, it may indicate a deeper problem with the fan assembly or the control circuit, potentially triggering diagnostic trouble codes like P0481. Ignoring these symptoms can result in severe engine damage, so it is essential to systematically diagnose and address the problem to maintain your vehicle's performance and safety.

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