Ram ProMaster 1500 Radiator Fan Isn't Working

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

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Reviewed by
Andrew Hajjar
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 ProMaster 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 ProMaster 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 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 ProMaster 1500

When troubleshooting radiator fan issues in a Ram ProMaster 1500, it's essential to adopt a methodical diagnostic approach. Begin by inspecting the fan assembly to ensure it is operational; a visual check can often reveal obvious signs of damage or disconnection. Next, assess the fan motor or clutch for any irregularities, as these components are crucial for fan operation. Following this, examine the fan relay and fuses, as electrical failures can prevent the fan from receiving power. Testing the coolant temperature sensor is also vital, as it plays a key role in signaling the fan to activate based on engine temperature. If these components appear functional, delve into the fan control module and engine cooling fan resistors, as faults here can disrupt normal fan operation. Conducting tests that simulate conditions requiring fan activation, such as raising the engine temperature, can help confirm whether the fan responds appropriately. If all else fails, consider replacing the radiator fan with a new unit to restore proper cooling functionality. By following this structured approach, you can effectively diagnose and resolve radiator fan issues in your Ram ProMaster 1500, ensuring your vehicle remains in optimal working condition.

What to Check When the Radiator Fan Isn't Working in a Ram ProMaster 1500?

When troubleshooting a non-working radiator fan in your Ram ProMaster 1500, it's essential to examine several common problems that could be at play. Start by inspecting the fan assembly itself, as a malfunctioning fan can prevent proper airflow and cooling. Next, check the fan clutch, which plays a critical role in engaging the fan when needed; if it's faulty, the fan may not operate as intended. Additionally, the coolant temperature sensor is vital for signaling the fan to turn on; a defective sensor may fail to send the correct signals, leading to overheating issues. By methodically checking these components, you can effectively diagnose and potentially resolve the radiator fan issue, ensuring your vehicle runs smoothly and efficiently.

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

When the radiator fan in your Ram ProMaster 1500 is not functioning, it is crucial to address the issue promptly to avoid severe consequences. A malfunctioning radiator fan can lead to overheating, which may cause extensive engine damage and costly repairs. Ignoring the problem can also compromise your vehicle's performance and safety, especially during hot weather or when towing heavy loads. Symptoms such as the engine temperature gauge rising or the air conditioning not functioning properly should not be overlooked, as they indicate that the cooling system is not operating effectively. Additionally, if the fan does not engage when needed, it could trigger fault codes that complicate diagnostics and repair efforts. Therefore, it is essential to investigate potential causes such as a faulty fan assembly, blown fuses, or issues with the coolant temperature sensor. Taking immediate action not only protects your vehicle but also ensures your safety on the road.

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Ram ProMaster 1500 Radiator Fan Not Working? Solutions