2020 Ram ProMaster 2500 Radiator Fan Isn't Working

Fix Non-Functional Radiator Fan in 2020 Ram ProMaster 2500

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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 2020 Ram ProMaster 2500 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 2020 Ram ProMaster 2500 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 steps should I take to diagnose the non-functioning radiator fan in my 2020 Ram ProMaster 2500?

To effectively diagnose a non-functioning radiator fan in your 2020 Ram ProMaster 2500, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by inspecting the fuse associated with the radiator fan; a blown fuse is a common and easily fixable issue that can halt fan operation. Next, examine the relay, which is responsible for supplying power to the fan. If the relay is faulty, it will need replacement to restore functionality. Following this, test the fan motor directly by applying power to it; if it fails to operate, the motor may require replacement. Additionally, check the temperature sensor, as it is crucial for activating the fan when needed. Ensure that it is functioning correctly and relaying accurate signals. Don’t overlook the wiring and connections; inspect for any loose or damaged wires that could disrupt the fan's operation. Finally, utilize a diagnostic tool to scan for any error codes related to the cooling system, as this can provide further insights into the underlying issue. By following this structured diagnostic approach, you can efficiently identify and resolve the problem with your radiator fan.

What are the common problems that could cause the radiator fan to stop working in a 2020 Ram ProMaster 2500?

When troubleshooting the radiator fan issues in a 2020 Ram ProMaster 2500, it's essential to understand the common problems that could lead to fan failure. A faulty fan motor is often the primary culprit, as it can prevent the fan from spinning, resulting in overheating. Additionally, a blown fuse in the fan circuit can interrupt the power supply, causing the fan to stop functioning altogether. Another potential issue is a defective relay, which is responsible for sending the electrical signal to the fan; if this relay fails, the fan won't operate. It's also important to check for broken fan blades, as damage can hinder the fan's ability to circulate air effectively. Lastly, a malfunctioning coolant temperature sensor may fail to activate the fan when the engine reaches high temperatures, leaving it inactive when it’s needed most. By identifying and addressing these issues, you can ensure that your radiator fan operates efficiently, helping to maintain optimal engine temperatures and prevent overheating.

How urgent is it to address the non-functioning radiator fan in a 2020 Ram ProMaster 2500?

Addressing a non-functioning radiator fan in your 2020 Ram ProMaster 2500 is not just a matter of convenience; it is a critical safety concern that demands immediate attention. The radiator fan plays a vital role in regulating engine temperature by dissipating heat from the radiator. When this component fails, the risk of engine overheating escalates significantly, which can lead to severe damage such as warped engine parts or even complete engine failure. This not only results in costly repairs but can also leave you stranded on the road, requiring towing services. Furthermore, an overheating engine can negatively impact your vehicle's performance, leading to decreased fuel efficiency and increased emissions. Therefore, it is essential to prioritize the repair of a non-functioning radiator fan to maintain the health and longevity of your vehicle, ensuring safe and efficient operation on the road.

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