Where is the fuse for the radiator fan located?

In most cars, the radiator fan fuse sits in the under-hood fuse box and is labeled either FAN, RADIATOR, ENGINE COOLING, or COOLING FAN; typical ratings are 15A or 20A. However, exact placement can differ by make and model, so always check your owner's manual or the fuse box diagram.

Understanding where it sits helps with diagnosing cooling issues. The radiator fan is critical for engine cooling, and a blown fuse can cause overheating. Some vehicles place the fan relay in the same box or in a separate panel, and newer designs may consolidate cooling components into a central power module. The following guide lays out common locations and steps to verify the fuse in your specific vehicle.

Common locations for the radiator fan fuse

Before scanning for the fuse, note that exact labeling and location depend on the vehicle’s design. Use the diagram on the fuse box cover as the primary guide.

• Under-hood fuse/relay box (engine bay) — the most common spot. Look for a slot labeled FAN, RADIATOR, ENGINE COOLING, or COOLING FAN. Fuses are typically 15A or 20A; the relay may be in the same box or a nearby panel.


• Interior fuse box (driver’s dash or glove box) — some models route the cooling-fan fuse through the cabin fuse panel; labels can read FAN or FAN RELAY.


• Power distribution center or Integrated Power Module — a few vehicles consolidate cooling-fan fuses/relays in a central module, which may be located in the engine bay or near the passenger footwell.


• Near the radiator or headlight area — on certain designs, the fan relay sits close to the radiator to minimize wiring; the fuse may be in the same box or a nearby one.

Because labels vary widely, the most reliable source is the owner’s manual or the diagram on the fuse box cover. If you still can’t locate it, ask a dealership or a qualified mechanic for help.

What to do if the fuse is blown

Before you inspect, ensure the engine is off and the keys are removed. Never touch hot components. Replace with a fuse of the same amperage rating; if it blows again, there is likely a short or a fault in the fan, relay, wiring, or temperature sensor.

• Open the appropriate fuse box and locate the radiator fan fuse/relay according to the diagram.


• Remove the fuse with a fuse puller or insulated pliers and inspect for a melted conductor or broken wire; you can also test continuity with a multimeter.


• Install a replacement fuse with the identical amperage rating; never exceed the rating.


• Reconnect and run the engine to observe whether the fan engages when the engine reaches operating temperature or when the A/C is turned on.


• If the new fuse blows again, stop driving and have the cooling system inspected for a short, faulty fan, relay, wiring damage, or a failing coolant temperature sensor.

Safety reminder: If the vehicle overheats, pull over, allow the engine to cool, and seek roadside assistance if necessary.

Model-specific notes

While the above covers common setups, some brands use different configurations. Always rely on the vehicle’s fuse box diagram and service manual for precise locations and fuse ratings. For hybrids and electric vehicles, cooling fans can be controlled by high-current circuits that may use dedicated relays or modules beyond a standard 12V fan fuse.

Hybrid and electric-vehicle considerations

In hybrids and EVs, the radiator cooling system may include additional fans or controllers; fuse and relay layouts vary more widely. Consult the specific owner’s manual for exact locations and precautions.

Summary

The radiator fan fuse is usually found in the under-hood fuse box and is labeled accordingly, but exact placement depends on the vehicle. Always refer to the fuse box diagram or the owner's manual for your model. If replacing a fuse, use the correct amperage and seek professional help if the fuse blows repeatedly or the fan still doesn’t operate. Prompt attention helps prevent overheating and related engine damage.

How do I fix my radiator fan not working?

To fix a non-working radiator fan, first check and replace any blown fuses. Next, test the fan motor directly with 121212V power to see if it spins, and if it doesn't, replace the motor. If the motor works, then check the fan relay by swapping it with a known good one, and if the fan still doesn't work, a faulty coolant temperature sensor or bad wiring are the next likely culprits. 
This video demonstrates how to test the radiator fan motor directly with 12V power: 59sMechanic BaseYouTube · Oct 9, 2023
Step 1: Check the basics

• Fuses: Locate the fuse box in your car (check the owner's manual for the location) and look for a blown fuse for the cooling fan. Replace it with a new fuse of the same amperage. If the new fuse blows immediately, there may be a short circuit in the wiring or the motor. 
• Coolant Level: Make sure the engine coolant reservoir is filled to the maximum mark. An extremely low coolant level can sometimes prevent the fan from activating correctly. 

Step 2: Test the fan motor 

• To test the motor, connect it directly to a 121212V power source using jumper wires. If the fan doesn't spin, the motor is likely bad and needs to be replaced. 

This video shows how to test the fan relay by swapping it with another one: 58sScotty KilmerYouTube · Mar 9, 2010
Step 3: Test the relay and sensor 

• Relay: A faulty fan relay can prevent the fan from getting power. Try swapping the fan's relay with a known good relay of the same type (like one from the horn or headlights). If the fan starts working, the old relay was the problem. 
• Coolant Temperature Sensor: The coolant temperature sensor tells the car's computer when to turn the fan on. You can test it by disconnecting the sensor. In most cases, the fan should start running. If it does, the sensor is likely faulty and needs replacement. 

Step 4: Check the wiring 

• Inspect all the wiring and connectors for the fan motor, relay, and sensor for any signs of damage, corrosion, or loose connections. Repair or replace any damaged wires. 

When to seek professional help

• If you've gone through these steps and the fan still doesn't work, or if you're uncomfortable with any of the diagnostic steps, it's best to consult a professional mechanic. Modern vehicle electronics can be complex, and a professional can perform more advanced diagnostics. 

Does a fuse control a radiator fan?

Yes, the radiator fan has a fuse, and it is often a larger fuse located in the engine compartment fuse box, though some vehicles may also have a smaller fuse for the fan control module. The exact location and amperage can vary, so it is essential to check your car's owner's manual or the fuse box lid for the correct information for your specific vehicle.
 
This video shows the location of the radiator fan fuses and relays in a Chevrolet Cruze: 55sElectrical Car Repair LIVEYouTube · May 11, 2019
What to do

• Locate the fuse box: The main fuse box is usually in the engine bay, but check your owner's manual to confirm the exact location. 
• Find the correct fuse: The lid of the fuse box or the owner's manual will have a diagram showing which fuse corresponds to the radiator fan. The fan often has a large, high-amperage fuse (e.g., 30A30 cap A30𝐴 to 50A50 cap A50𝐴), and sometimes a smaller fuse for the control module. 
• Inspect the fuse: Visually check the fuse. If the metal wire inside is broken, the fuse is blown and needs to be replaced. 
• Test the fuse (if needed): If it's not obvious, you can use a voltmeter to test the fuse for continuity. A good fuse will show a completed circuit, while a blown one will not. 
• Replace the fuse: If the fuse is blown, replace it with a new one of the exact same amperage. Using a fuse with a higher amperage can be dangerous and damage your fan or other components. 

Important considerations

• A blown fuse can be a symptom of a larger problem, such as a failing fan motor or a wiring issue. 
• If a new fuse blows immediately or shortly after replacement, further diagnosis is needed to find the underlying cause. 

How can you tell if a fan fuse is blown?

You can tell if a fan fuse is blown by first checking for symptoms like the fan not working at all, which could be accompanied by a burning smell or a blackened appearance on the fuse. For a definitive test, use a multimeter or continuity tester to check for a break in the filament; if there is no beep or reading, the fuse is blown. 
Symptoms to look for

• Fan doesn't turn on: If the fan is completely silent and shows no signs of life, it's a strong indicator of a blown fuse. 
• Intermittent operation: If the fan turns on briefly before shutting off, the fuse might be damaged but not completely broken. 
• Burning smell: A burning odor coming from the fuse holder or the unit itself suggests the fuse may have failed under an overload condition. 
• Visible damage: Inspect the fuse visually. A blown fuse will show a broken or missing internal metal strip. Some fuses have a small window where you can see this. You may also see dark marks or a blackened appearance on the fuse or in its holder. 

How to test with a multimeter or continuity tester
You can watch this video to learn how to use a multimeter to check for a blown fuse: 59sElectro UniversityYouTube · Nov 22, 2022

1. Disconnect power: Ensure the fan is unplugged or the circuit breaker is turned off before you touch any wiring. 
2. Remove the fuse: Take the fuse out of its holder. 
3. Set the multimeter: Set your multimeter to the "continuity" or "diode" setting. 
4. Test for continuity: Touch the multimeter probes to each metal end of the fuse. 
5. Interpret the results:
   • Good fuse: If the multimeter beeps or shows a reading, there is continuity, and the fuse is good. 
   • Blown fuse: If there is no beep or reading, the fuse is blown and needs to be replaced. 

Can a blown fuse cause a radiator fan not to work?

A blown fuse is a common reason for electric radiator fan failure, as it disrupts the electrical circuit powering the fan. Symptoms: The fan won't turn on at all. Causes: Electrical surges, short circuits, or an overworked system.