If you’re experiencing issues with your Subaru Legacy’s cooling system, such as overheating or a lack of airflow, it’s possible that the fan relay is malfunctioning. Replacing the fan relay is a relatively simple and inexpensive repair that you can do yourself with a few basic tools. In this article, we’ll walk you through the steps on how to replace the fan relay in a 2005 Subaru Legacy.
The fan relay is a small electrical component that controls the operation of the cooling fans. When the engine reaches a certain temperature, the fan relay sends a signal to the fans to turn on. If the fan relay is malfunctioning, the fans may not turn on when they’re needed, which can lead to overheating. Replacing the fan relay is a relatively simple repair that can be completed in about 30 minutes.
To replace the fan relay, you’ll need a few basic tools, including a Phillips head screwdriver, a flat head screwdriver, and a pair of needle nose pliers. You’ll also need a new fan relay. Once you have your tools and materials, follow these steps to replace the fan relay:
Identifying the Fan Relay
The fan relay is a crucial component in the cooling system of your Legacy 2005, and its failure can lead to overheating and costly repairs. Replacing the fan relay is a relatively simple and inexpensive task that can be performed in a few steps.
To identify the fan relay, refer to the owner’s manual or consult an online resource specific to your model. It is typically located in the fuse box, which is usually found under the hood or in the cabin. The fuse box will have a diagram to help you locate the fan relay. It is commonly a small, square or rectangular device with terminals for electrical connections. The fan relay may be labeled as “FAN” or “RAD” (for radiator).
| Year | Location |
|---|---|
| 2005 | Under the hood, in the fuse box near the battery |
Safety Precautions
Wear Protective Gear
When working on any electrical system, it is crucial to prioritize safety by wearing appropriate protective gear. This includes:
– Insulated gloves: to prevent electrical shock
– Safety glasses: to protect your eyes from debris and sparks
– Long sleeves and pants: to minimize exposure to high temperatures and electrical components
Disconnect Power Source
Before commencing any work, it is imperative to disconnect the power source. Follow these steps:
1. Locate the fuse box or circuit breaker panel.
2. Identify the fuse or circuit breaker that controls the fan and turn it off.
3. Verify that the power is disconnected using a voltage tester.
Allow Time for Cooling
Electrical components can retain heat even after the power is disconnected. Allow ample time for the fan and surrounding components to cool down before handling them. This will prevent burns and potential damage to the electrical system.
Work in a Well-Ventilated Area
Electrical repairs can generate smoke or fumes. Ensure adequate ventilation by working in an open or well-ventilated area to avoid inhaling harmful gases.
Locating the Relay Box
Before you begin replacing the fan relay, you’ll need to locate the relay box first. To do so, follow these steps:
- Open the hood of your Legacy 2005.
- Look at the fuse box located in the engine compartment.
- The relay box will be located near the fuse box.
Removing the Old Relay
To remove the old relay, you will need to gather your tools and locate the relay. The relay is usually located in the fuse box, which is typically under the hood of your car. Once you have located the relay, you will need to disconnect the electrical connector. To do this, simply press on the release tab and pull the connector straight up. Once the electrical connector is disconnected, you will need to remove the relay from its socket. To do this, simply pull the relay straight up. Be careful not to damage the relay or its socket when removing it.
Steps:
- Gather your tools.
- Locate the relay.
- Disconnect the electrical connector.
- Remove the relay from its socket.
Installing the New Relay
With the old relay removed, you can now install the new relay. Start by aligning the new relay with the terminals on the socket. Make sure that the polarity of the new relay matches the polarity of the old relay. In other words, the positive terminal on the new relay should be connected to the positive terminal on the socket, and the negative terminal on the new relay should be connected to the negative terminal on the socket.
Once the new relay is aligned, push it into place until it snaps into position. Make sure that the relay is securely seated in the socket.
Next, reconnect the wires to the new relay. Be sure to connect the positive wire to the positive terminal on the relay, and the negative wire to the negative terminal on the relay.
Finally, start the engine and verify that the fan is working properly. If the fan is not working, check the connections to make sure that they are secure. You may also need to replace the fuse or circuit breaker for the fan.
| Step | Description |
|---|---|
| 1 | Align the new relay with the terminals on the socket. |
| 2 | Push the new relay into place until it snaps into position. |
| 3 | Reconnect the wires to the new relay. |
| 4 | Start the engine and verify that the fan is working properly. |
Troubleshooting Common Issues
1. Fan Not Turning On
Check the fuse or circuit breaker that powers the fan. If it is blown or tripped, replace it. Check the fan motor for continuity. If there is no continuity, the motor needs to be replaced.
2. Fan Not Turning Off
Check the fan relay. If the relay is stuck in the on position, it needs to be replaced. Check the fan speed switch. If the switch is stuck in the on position, it needs to be replaced.
3. Fan Making Noise
Check the fan blades for damage. If the blades are damaged, they need to be replaced. Check the fan motor bearings for wear. If the bearings are worn, the motor needs to be replaced.
4. Fan Not Blowing Air
Check the fan filter. If the filter is clogged, it needs to be replaced. Check the fan ductwork for blockages. If the ductwork is blocked, it needs to be cleaned.
5. Fan Vibrating
Check the fan motor mounting bolts. If the bolts are loose, tighten them. Check the fan blades for balance. If the blades are not balanced, they need to be replaced.
6. Fan Not Responding to Thermostat
Check the thermostat wires. If the wires are loose or damaged, they need to be repaired or replaced. Check the thermostat settings. If the thermostat is not set to the correct temperature, adjust it. Check the fan relay. If the relay is not working properly, it needs to be replaced.
| Possible Cause | Solution |
|---|---|
| Blown fuse or tripped circuit breaker | Replace the fuse or reset the circuit breaker |
| Faulty fan motor | Replace the fan motor |
| Stuck fan relay | Replace the fan relay |
| Stuck fan speed switch | Replace the fan speed switch |
| Damaged fan blades | Replace the fan blades |
| Worn fan motor bearings | Replace the fan motor |
| Clogged fan filter | Replace the fan filter |
| Blocked fan ductwork | Clean the fan ductwork |
| Loose fan motor mounting bolts | Tighten the bolts |
| Unbalanced fan blades | Replace the fan blades |
| Loose or damaged thermostat wires | Repair or replace the wires |
| Incorrect thermostat settings | Adjust the thermostat settings |
| Faulty fan relay | Replace the fan relay |
Safety Precautions
Before attempting any electrical work, ensure safety by disconnecting the vehicle’s battery negative terminal.
Accessing the Fan Relay
Locate the fuse box under the hood, typically marked as “Engine” or “Power Distribution.” Open the fuse box cover to access the fan relay.
Removing the Fan Relay
Using relay pullers or pliers, carefully remove the old fan relay from its socket. Note the orientation of the relay for correct installation.
Inspecting the Fan Relay
Visually inspect the contacts on the relay for any damage or corrosion. If the relay is faulty, replace it with a new one.
Installing the New Fan Relay
Insert the new relay into the socket in the same orientation as the old one. Press firmly to secure it in place.
Reconnecting the Battery
Reconnect the battery negative terminal and start the engine. Verify that the cooling fan is operating correctly.
Tips for Optimal Performance
Follow these additional tips for ensuring optimal cooling system performance:
7. Monitor Coolant Temperature
Keep an eye on the temperature gauge or warning lights to ensure the cooling system is maintaining the proper operating temperature. If the engine runs hot, investigate potential causes such as coolant leaks, thermostat issues, or radiator blockage.
| Symptom | Possible Cause |
|---|---|
| Overheating engine | Coolant leak, faulty thermostat, radiator blockage |
| Engine cooling too slowly | Dirty radiator, clogged coolant lines |
Precautions for Replacing a Legacy Fan Relay
Before beginning this procedure, it is important to take the following precautions:
1. Disconnect the Negative Battery Terminal
To ensure safety, disconnect the negative terminal of the battery before attempting any electrical work.
2. Allow the Engine to Cool
Wait for the engine to cool down before beginning work. This will prevent burns and protect the electrical components.
3. Wear Gloves
Protect your hands from sharp edges and electrical components by wearing gloves.
4. Use the Correct Tools
Have the appropriate tools, including a socket wrench, screwdriver, and pliers, ready for the task.
5. Work in a Well-Ventilated Area
Batteries and electrical components can emit fumes. Work in a well-ventilated area to avoid inhaling harmful gases.
6. Locate the Fan Relay
Identify the location of the fan relay in your Legacy’s engine bay. It is typically found near the radiator.
7. Disconnect the Electrical Connector
Locate the electrical connector attached to the fan relay and carefully disconnect it.
8. Remove the Old Relay
Using a socket wrench or pliers, gently remove the old fan relay from its mounting bracket. Take note of its orientation for correct reinstallation.
| Additional Precaution for Removing the Old Relay (for Experienced Mechanics): |
|---|
|
If the old relay does not come out easily, insert a small screwdriver or pry tool into the slots and carefully pry it loose. Be cautious not to damage the bracket or surrounding components. |
Additional Considerations for Specific Models
2005 Subaru Legacy 2.5i and Outback 2.5i
Locate the fan relay in the fuse box under the hood, labeled as “Rad Fan Relay”. Replace the relay with a new one of the same type.
2005 Subaru Legacy GT and Outback XT
Access the fuse box by removing the cover under the steering column. Locate the “Rad Fan Relay” relay and replace it with a new one of the same type.
2005 Subaru Forester
Find the fuse box under the hood, near the battery. The “Rad Fan Relay” relay is labeled as such. Replace it with a new relay of the same type.
2005 Subaru Impreza
Locate the fuse box under the hood, near the battery. The “Rad Fan Relay” relay is labeled as such. Replace it with a new relay of the same type.
2005 Subaru WRX and STi
Access the fuse box located under the hood, near the battery. Locate the “Rad Fan Relay” relay and replace it with a new one of the same type.
Maintaining the Fan Relay
To ensure optimal performance and longevity of your fan relay, regular maintenance is essential. Here’s a comprehensive guide to maintaining the fan relay in your Legacy 2005:
1. Inspect Wiring Connections
Inspect the wiring connections to and from the fan relay. Look for any loose, frayed, or damaged wires. Ensure all connections are tight and free of corrosion.
2. Check Ground Connection
Verify that the fan relay has a proper ground connection. A good ground is crucial for proper relay operation. Check the ground wire and ensure it is securely fastened to a clean metal surface.
3. Test Fan Operation
Periodically test the fan operation to ensure the relay is functioning correctly. Turn on the A/C or heater and listen for the fan running. If the fan does not operate, the relay may need to be replaced.
4. Replace Worn or Loose Components
If any components of the fan relay system become worn or loose, they should be replaced. This includes the relay itself, fan motor, or wiring harness.
5. Lubricate Moving Parts
Lubricate any moving parts of the fan relay, such as the relay switch or fan motor, to reduce friction and ensure smooth operation.
6. Clean the Relay
Over time, dirt and debris can accumulate on the fan relay. Clean the relay using an electrical contact cleaner or compressed air to remove any buildup.
7. Avoid Overheating
High temperatures can damage the fan relay. Avoid exposing the relay to excessive heat sources, such as direct sunlight or engine exhaust.
8. Handle with Care
When handling the fan relay, hold it by the body to avoid damaging the terminals or internal components.
9. Use Proper Tools
Use appropriate tools for replacing or servicing the fan relay. This includes a socket wrench for removing the relay and a multimeter for testing electrical continuity.
10. Follow Manufacturer’s Instructions
Refer to the manufacturer’s instructions for specific maintenance procedures and guidelines. This will ensure proper installation and operation of the fan relay.
How To Replace Fan Relay Legacy 2005
The fan relay is a small electrical component that controls the operation of the cooling fan. It is located in the engine compartment, usually near the radiator. The fan relay is responsible for turning the fan on and off as needed to regulate the engine temperature.
If the fan relay fails, the cooling fan will not operate and the engine may overheat. Replacing the fan relay is a relatively simple task that can be completed in about 30 minutes.
Tools and Materials Needed:
- New fan relay
- 10mm socket wrench
- Phillips screwdriver
Step-by-Step Instructions:
- Disconnect the negative battery terminal.
- Locate the fan relay. It is usually located in the engine compartment, near the radiator.
- Remove the electrical connector from the fan relay.
- Remove the two bolts that hold the fan relay in place.
- Remove the old fan relay and install the new one.
- Tighten the bolts that hold the fan relay in place.
- Reconnect the electrical connector to the fan relay.
- Reconnect the negative battery terminal.
People Also Ask About How To Replace Fan Relay Legacy 2005
Where is the fan relay located on a 2005 Subaru Legacy?
The fan relay is located in the engine compartment, near the radiator.
What are the symptoms of a bad fan relay?
The symptoms of a bad fan relay include:
- The cooling fan does not operate.
- The engine overheats.
- The temperature gauge reads high.
