Honda Accord Cooling Fan Wont Turn Off

The cooling system of an engine is critical for maintaining optimal temperatures. The cooling fan is an important component that controls air flow to cool the radiator. However, cooling fans in Honda Accords may continue to run even after the engine is turned off. This constant airflow can quickly drain the battery of the vehicle.

In this article, we’ll walk you through the troubleshooting and repair process for a Honda Accord cooling fan that won’t turn off. The thermostat, electrical relays, fuses, radiator fan switch, and timer module will all be checked. You can identify and fix the underlying problem with some basic mechanical skills and the right diagnostic approach. Continue reading to learn how to repair your Honda Accord’s cooling system.

Check The Thermostat

The engine thermostat should be checked first. This component monitors coolant temperature and activates the radiator fan when necessary. A thermostat that is stuck closed can cause the fan to run continuously.

Begin by visually inspecting the thermostat housing. Look for coolant leaks, which could indicate a faulty gasket seal. Check to see if the upper radiator hose feels hot when the engine is cold. If this is the case, the thermostat is most likely stuck closed. The constant fan problem should be resolved by replacing the thermostat and gasket.

When working near hot engine components, exercise extreme caution. Allow the vehicle to completely cool before attempting thermostat replacement. For the correct procedure, consult the service manual for your Honda Accord.

Inspect The Cooling Fan Relays And Fuses

Faulty electrical relays and blown fuses can also cause cooling fan malfunctions. The radiator fan is controlled by two relays in the under-hood fuse box. Swap the relays to see if one is faulty. Check the fuses for the cooling fan circuit as well. Any blown fuses should be replaced with fuses of the same amperage rating.

If the fan stops after you’ve checked the fuses and relays, you’ve found the problem. Make sure to replace the faulty relay or fuse. This inexpensive repair can restore your Accord’s cooling system to working order.

Check The Radiator Fan Switch

The radiator fan switch detects coolant temperature and activates the fan when necessary. Continuous fan operation can be caused by switch issues.

The switch is located on the upper radiator hose. Unplug it and inspect it for leaks or corrosion. Next, start the engine and connect the switch connector terminals with a piece of wire. If the fan starts, the switch is faulty and must be replaced.

The cooling fan problem should be resolved by installing a new radiator fan switch. To ensure proper fit and function, use an OEM Honda replacement part.

Inspect The Cooling Fan Timer Module

The cooling fan timer module in Honda Accords controls fan operation after the engine is turned off. If the fan continues to run after you turn off the car, the timer module may be malfunctioning.

2003 honda accord radiator fan relay
2003 honda accord radiator fan relay

Behind the glove box is the timer module. Check for any loose wiring connections by removing the cover panel. Then, using a multimeter, check the module connector for power and ground. If both power and ground are present but the fan continues to run, the timer module must be replaced.

On Accord models, installing a new timer module is simple. This fix will ensure that the cooling fan turns off properly after the engine is turned off.

Radiator Fan Replacement

If you’ve checked the thermostat, fuses, relays, fan switch, and timer module and the Honda Accord cooling fan still runs continuously, the radiator fan may need to be replaced.

Examine the fan blades and motor for damage. When the fan is turned on, make sure it spins freely. A new replacement fan is required if the fan motor is seized or the blades are severely cracked.

2007 honda accord fan keeps running
2007 honda accord fan keeps running

To replace a radiator fan, first disconnect all electrical connectors and the fan shroud. The fan assembly can then be removed by removing the mounting bolts. The opposite of removal is installation. For the best cooling performance, use an OEM Honda replacement fan.

Professional Automotive Diagnosis

With the right troubleshooting, you can likely resolve Honda Accord cooling fans that won’t shut off. However, if you’ve tried all the steps outlined here, it may be time to have a professional technician diagnose the issue. Dealerships and trusted mechanics have specialized tools and software to accurately pinpoint electrical gremlins.

Don’t continue driving your Accord if the cooling fan drains the battery. Have the car towed to a shop for diagnosis. With their expertise, the problem can be identified and repaired correctly the first time.

What Causes The Radiator Fan To Stay On When The Car Is Off?

The most common cause of a radiator fan staying on when the car is off is a faulty cooling fan relay or module. The relay controls power to the fan, and if it sticks closed, the fan will continue running after the vehicle is shut off. A failed module can also cause the same symptom. Other possible causes include a stuck thermostat, leaking coolant triggering the low coolant sensor, and shorted wiring. 

Inspect the fan relays and modules first. If those check out, look for leaks, thermostat issues, or electrical shorts that could be triggering the fan unnecessarily. Replacing faulty parts should stop the fan from running continuously with the engine off.

What Causes The Cooling Fan To Stay On?

A stuck closed thermostat is the most likely culprit for a cooling fan that stays on. The thermostat gets stuck in the closed position, so it constantly signals the fan to run thinking the engine is overheating. Electrical problems like a bad relay, faulty sensor, or short in the fan wiring can cause similar symptoms. 

Check the thermostat first by feeling if the radiator upper hose is hot with a cold engine. If so, replace the thermostat. Inspect relays, sensors, fuses, and wiring for any electrical faults keeping the fan on. The fan motor may also be seized causing continuous operation.

What Are The Symptoms Of A Bad Cooling Fan Relay?

Some clear signs your cooling fan relay has failed include the fan not turning on when the engine gets hot, fan staying on after the vehicle is turned off, fan running at the wrong speeds, and a burning smell from the relay itself. 

You may also notice the engine temperature gauge reading hotter than normal if the fan relay is not working. Testing the relay for power on both sides and continuity can confirm if it is bad. Replacing the faulty cooling fan relay will restore normal fan operation and prevent engine overheating issues.

Also Read: How To Install Fog Lights On Honda Accord?


A constantly running Honda Accord cooling fan is an annoyance that must be addressed as soon as possible. Failure to address the underlying issue can result in battery drain, overheating, and costly repairs in the future. Drivers can troubleshoot several culprits, such as the thermostat, fuses, fan switch, or timer module, with some basic mechanical knowledge and diagnostic testing. 

Based on their training and equipment, trusted automotive technicians can properly diagnose and repair the cooling fan problem for difficult electrical issues. Addressing Honda Accord cooling fans that refuse to shut off as soon as possible will restore your engine’s cooling system to normal operation.

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Ammar Masoud

I have had a long and fulfilling career in the automotive industry, primarily with Honda and Acura. With 15 years of experience as a Honda service technician, I became highly skilled in repair and maintenance, gaining a deep understanding of these vehicles. After many years in the automotive field, I decided to embark on a second career in industrial manufacturing. It was a significant change, but I found that the skills I had honed in the automotive industry were incredibly valuable in my new role. In my current position in industrial manufacturing, the demand for quality workmanship and meticulous attention to detail is paramount. Fortunately, these are traits that I have cultivated throughout my years in the automotive industry. I take pride in applying these skills to meet the high standards expected in the manufacturing sector.