Dodge D150 Radiator Fan Isn't Working

Diagnosing the Causes of a Non-Functioning Radiator Fan in Your Dodge D150 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 Dodge D150 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 D150 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 D150

When troubleshooting radiator fan issues in your Dodge D150, it's essential to adopt a systematic diagnostic approach. Start by checking the fuse associated with the radiator fan; a blown fuse can often be the simplest fix. If the fuse is intact, manually spin the fan blade to ensure there are no obstructions that could impede its movement. Next, monitor the engine temperature closely; if it rises excessively or the fan runs continuously, this may indicate a deeper issue, such as a malfunctioning cooling fan relay. Additionally, inspect all relays and fuses related to the fan system, as a failure in these components can disrupt the fan's operation. If you encounter any diagnostic trouble codes, such as P0481, it’s crucial to understand that this points to a specific malfunction in the cooling fan control circuit, which may require further investigation. By following this structured approach, you can effectively diagnose and potentially resolve radiator fan issues, ensuring your vehicle runs smoothly.

How to Diagnose and Fix a Non-Working Radiator Fan in a Dodge D150?

When tackling the issue of a non-working radiator fan in your Dodge D150, it's essential to understand the common problems that could be at play. Start by checking the fuse associated with the radiator fan; a blown fuse is often the first sign of trouble. If the fuse is burnt, replace it with one of the same size and type, but be cautious—if it blows again, this could indicate a more serious electrical issue, such as a short circuit or excessive draw. Next, inspect the fan motor itself for any visible damage or wear, as a malfunctioning motor can prevent the fan from operating. Additionally, ensure that the coolant levels are adequate, as low coolant can affect the fan's performance. If your vehicle is equipped with air conditioning, running the AC can help diagnose the problem; the radiator fan should activate when the AC is on. If it doesn’t, this could point to issues with the fan motor, wiring, or even the AC system itself. Lastly, don’t overlook the fan clutch, which can wear out over time and affect the fan's operation. 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 D150?

When the radiator fan in your Dodge D150 fails to operate, it’s crucial to address the issue promptly to avoid severe engine overheating, which can lead to costly repairs and potential safety hazards. A malfunctioning radiator fan can stem from various problems, including a blown fuse, a faulty starter relay, or even a defective fan motor. Ignoring these symptoms can exacerbate the situation, leading to engine damage or complete failure. Additionally, issues such as damaged wiring or a malfunctioning coolant temperature sensor can further complicate the problem. To effectively troubleshoot, start by checking the fuses and inspecting for any obstructions that may hinder the fan's operation. Remember, the radiator fan is essential for maintaining optimal engine temperature, and neglecting its repair can result in significant consequences for your vehicle's performance and longevity. Taking immediate action not only safeguards your engine but also ensures your safety on the road.

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Dodge D150 Radiator Fan Not Working: Causes & Solutions