Replacement of Radiator Fan Switch: How to REPLACE Radiator Fan Switch on 2003 - 2007 Accord & more

In this video, I carry out radiator fan switch replacement on the 2003 - 2007 Accord. How to replace radiator fan switch or replacement of radiator fan switch is one critical repair to prevent car engine overheating or stop car engine overheating caused by a failing radiator fan switch. A failed radiator fan switch aka engine coolant temperature switch (in some cars) or the engine coolant temperature switch (engine coolant switch), is one of the causes of engine overheating. One major early symptom of a failing switch is that the cooling fans come on late.
Although I demonstrate this on the 2003-2007 Accord, the procedure is similar in other Honda with the K24A engine. Replacement radiator fan switch becomes a vital task as cars age. Failing to do this is one of the things that make a car engine overheat. Radiator fan switch symptoms vary from delay in cooling fans coming on to drivability issues. Prevent overheating of engine proactively by changing this as well as the thermostat. The same part used in this video is used in varying years of the following Honda cars: Accord, Civic, Odyssey, Pilot, Insight, S2000 and more.
After fixing this, the temperature at which my cooling fans come on has reduced. Also, the fans stay on for longer.

[@jamesk.herder624]

Your video was very helpful . It addressed the issue I’m having with my 04 Accord. Please continue to post helpful videos . I’ll let you know if my problem is corrected.

[@DIYAutoworksNG]

Happy to hear you found it useful. Many thanks for the compliment. Will do my best! Be sure to let me know how it goes.

[@mistytrewin8661]

Thanks very explanatory

[@DIYAutoworksNG]

You're welcome.

[@eyelidman09]

Thank you. Very helpful.👍🇬🇧🔧👍

[@DIYAutoworksNG]

Glad you found the video helpful. Many thanks!

[@MaxamillionTaylor]

Great video

[@DIYAutoworksNG]

Thanks

[@TheArkBand]

nice , very nice , helpful

[@DIYAutoworksNG]

Thanks for the compliment!

[@joshua.sanchez9689]

Great 👍 video 🙏 amigo

[@DIYAutoworksNG]

Gracias senior

[@Delight.AutoCRAFT]

I have na 07 accord, bought used. The fan was connected directly. I'm reversing it now but no ground to the radiator temp sensor wire or fan trigger sensor wire

[@DIYAutoworksNG]

I can imagine. If they've been cut, you'd need get ground from somewhere.

[@mykneeshurttt]

Hi, I have a 2005 Accord EX 2.4L. Do you know the appropriate part numbers to replace the thermostat and ECT sensor 2? I tried entering the part numbers in your video, but the website is telling me those parts wont fit in my car. Thanks for the video

[@DIYAutoworksNG]

Best to just type in your VIN at this website, it will pull up the exact parts for your car. www.hondapartscheap.com

[@chevyss18]

Hello I’m swapping my fan switch on my 2007 Acura tsx but when I took out the old one it looks like the one on this video , but you said they switched the design?? Idk I’m confused 😩

[@DIYAutoworksNG]

Hi. I was specifically referring to the 2005 Accord and upward for the 7th gen. The Acura may be different. Just go ahead and replace the exact part you took out. Should have the part number on it. For even more assurance, plug your VIN into hondapartsnow.com and search for the part. The part number of what you find is what you should use.

[@abdulmohsenalmulhim7629]

Hello, i have a 208 accord 2.4L, when i turn AC on or idle until temp reach 98 fans run on, but when i driving at highway with AC on and radiator temp excessed 100 c fans never come on as I'm leaving an area which excessed 53c Celsius at summer. Is this issue related to fan switch sensor or something else ?

[@DIYAutoworksNG]

What you describe is the exact reason why I decided to change mine including the thermostat as a precaution.

[@jeanenecarter5322]

I have an 07 accord but the problem I’m having is the connector that the radiator cooling switch plugs into is more square. I can’t find a switch ANYWHERE to fix it! Please help!

[@DIYAutoworksNG]

Have you tried honda dealer sites? E.g. hondapartscheap.com. Use your VIN to get exactly the part you need. Your car uses a coolant temperature sensor as against the radiator switch shown in this video.

[@sar9907]

The Minute i start my car the fan starts right up. Even outside temp is -30 °C. So could it be a faulty thermostat or fan switch? Thanks for putting time to make this vedio. Any help is appreciated.

[@DIYAutoworksNG]

Thanks for the compliment. A couple things can cause the cooling fans to run constantly even in cold weather: bad fan switch, stuck cooling fan relay or the ECM thinks the AC compressor is on. For a bad fan switch, check the temperature reading of the coolant and the intake air temperature (IAT) sensor. Both should be identical when the car is cold. You can check this via live data using most basic scan tools. If the coolant temp is significantly above IAT and ambient temperature, it's bad. For a stuck relay, just swap the cooling fan relay with an identical one in the fuse box (if available), if it works normally, it's the relay. For the ECM thinking the AC is on, again AC module live data will display the status of the AC compressor clutch. It should be OFF if the AC is off. For this one you will need a more advanced tool with access to the AC system. Could be the compressor clutch relay. You can start with the 1st 2 though.

[@nevoitzhaki]

Hello, i have same issue, i replaced the cooling fan switch, for aftermrket sensor, (fae). My fan turn on at same as you,) 96-98-102) What cause that? How you fix it? You disnt explain in the video, please explain

[@DIYAutoworksNG]

On things like this, I ALWAYS use OEM parts. Mine was turning on at 100oC before replacement. After replacement with OEM, it started turning on at 98oC. Is your car a 2005 and above? If so, it also has an additional coolant temperature sensor mounted close to the thermostat. You may need to replace that too. I would recommend you use OEM.

[@nevoitzhaki]

@@DIYAutoworksNG i have crv 2005 - rd8 (k20a4). what is the whole fix that help you?...(ishold replace the coolnat fan switch again i have got one oem already), but if not.. the aditional colant sensor it is the end of the process?

[@Hooterzutoob]

I have a 2003 honda accord 4 cyl, both of the fans run when I turn the AC on but the radiator fan won't come on after idling for quite some time. Would this be the radiator fan switch that you replaced on this video? Thanks for the help

[@DIYAutoworksNG]

You'll need to monitor the coolant temperature via livedata to establish the temp is reaching the temperature at which the fan should come on. If the ambient temperature is very cold it will take a longer time for the radiator fan to come on during idling.

[@DavidRodriguez-iu5ej]

Hola. tengo el mismo problema. Enciendo el a/c y los ventiladores prenden normal pero si los apago el ventilador del radiador no prende y el carro se calienta. ¿Pudiste solucionar tu problema?

[@Proscalecrawler]

@@DavidRodriguez-iu5ejsame problem. Did u find a fix?

[@IanTV8]

I have a 2007 Honda Accord 3.0 ex and its overheating. the fan on the passenger side doesnt come on but the fan is good. Ive replaced the thermostat, the sensor that is just behind the grill, all coolant. even tried a new fan and overflow bottle. O switched arpund the relays but that fan still does not come on. When i turn AC on the fan on driver side comes on but not the one on the passenger side. HELP!! I don't know why it won't work?

[@DIYAutoworksNG]

Have you used a multimeter to check for 12v at the connector for that passenger side fan when the AC is on?

[@IanTV8]

@@DIYAutoworksNG i have not yet. I've direct connected the fan with leads straight from the battery and it comes on. i haven't tested the other connection yet. I'll try that and see of im getting any power.

[@DavidRodriguez-iu5ej]

¿Que año es tu automóvil? Tengo un accord 2005 pero el sensor de temperatura es diferente al tuyo. Es más delgado.

[@DIYAutoworksNG]

Yes. Mine is 2003. Honda changed from a switch to the sensor in 2005.

[@felixalicea9326]

My fans turn on with my AC but never turn on when the car is at running temp and it cause the car to smoke but not over heat can it be this sensor

[@DIYAutoworksNG]

Hello. The fan should be off except if it gets above operating temp. This will take several minutes of idling. Are you able to read the coolant temperature via live data? What kind of smoke are you referring to? From the engine or exhaust?

[@felixalicea9326]

@@DIYAutoworksNG yeah even when my car has been idling for 35-40 min the fans never cut on until I turn my AC on and from the engine kind of looks like it’s coming from the middle of the radiator

[@DIYAutoworksNG]

There are a number of things you would need to troubleshoot correctly since they are a couple potential culprits... I suggest reading live data with any scan tool to determine if the car gets up to operating temperature (around 90oC). Does the temperature exceed the middle mark? If it goes past operating temperature and crosses the mid mark substantially, you could have a bad radiator fan relay, radiator fan switch etc. If it takes a long while before it comes on, you may have a stuck open thermostat. Establishing where it gets to in terms of temperature is paramount.

[@DIYAutoworksNG]

The steam bit might be a leak. Does your coolant level drop?

[@felixalicea9326]

@@DIYAutoworksNG yes my coolant level drops slowly and my ac isn’t blowing cold just warm

[@mula_2472]

Do I add coolant back to radiator?

[@hammergohammer012]

duh stupid

[@brooklyn7941]

If it's bad it won't turn the fan on at all only when u press the ac ?

[@DIYAutoworksNG]

Yes.

[@brooklyn7941]

@@DIYAutoworksNG ok kuz when mines get to operating temperature that radiator fan doesn't kick and then the temp level starts to rise after idling for a couple of mins afterwards of it heating up in it the fans only kick in when I turn the ac on

[@DIYAutoworksNG]

If you using a scanner, at what temperature does the fan turn on or not turn on?

[@brooklyn7941]

@@DIYAutoworksNG oh I ain't got no scanner guess that's where I messed up at then .

[@brooklyn7941]

@@DIYAutoworksNG but the radiator has a leak at the top next to the hose them aluminum teeth is most likely no good Becuase I went to top it off right and I seen the coolant just leaking out the aluminum teeth

[@joseferleon]

Damn are yahh seeing this 255k miles are those original miles or did you already did a motor swap

[@DIYAutoworksNG]

Original miles. Same motor, same transmission.

[@MrBluoct]

Thanks. Also no heat 2007

[@DIYAutoworksNG]

No heat has multiple causes. Low coolant, stuck open thermostat, defective heater core valve etc.

[@MrBluoct]

@@DIYAutoworksNG All being replaced this weekend Good times That Accord two part thermostat housing should be elevated as a PSA

[@MrBluoct]

@@DIYAutoworksNG Just changed all three - presto heat Replacing old / original Honda hoses is brutal. For others- novices pre-purchase replacement hoses and hose clamps I’m sure there are tricks but not worth my time and plus they are typical old hoses PSA 🆘🆘🆘🧚🏼‍♀️ Also search for Denso replacement radiator - comes with radiator cap and fitting for temp sensor - much nicer vs the over priced local auto store car quest crap that does not allow the sourced radiator cap to fit… they reordered the car quest radiator and the same problem and wasted three days ☠️☠️☠️

[@emmanuelnsemoh9438]

Can I get a contact I can reach you with . Cos my car has similar issues

[@DIYAutoworksNG]

Hi. You can reach me here or on instagram @piykediyautoworksng

[@rangersforrebellion1758]

The both fans come on? With ac on?

[@DIYAutoworksNG]

Yep. Just the way Honda designed it run.

[@mustyali9529]

Where do you source your OEM parts from?

[@DIYAutoworksNG]

I bought this particular OEM part from hondapartscheap.com. On some occasions, I also get new OEM parts from Amazon. Used ones, I get locally at parts markets.

[@mustyali9529]

@@DIYAutoworksNG Thanks bro

[@DIYAutoworksNG]

You're welcome.

[@vendulapalkova7577]

Shouldn't the fans come on when you turn your AC on?

[@DIYAutoworksNG]

They should.

[@Stevesbe]

My fans don't turn on till the engine is hot but then it doesn't turn off 2004 Honda accord ex 2.4l

[@DIYAutoworksNG]

This could be a number of things, sticky cooling fan relay, car temp doesn't drop below the threshold for the fans to turn off (overheating issue), AC is left on etc. Can you confirm this is with the AC off? If so I suggest checking coolant temp via live data check for what temp at which the fans come on. Also check the temp it stays at. When the fans come on (without the AC) it should turn off when thr coolant temp drops by about 4-5oC. If the temp drops by around this number but the fans stay on, my money is on a sticky fan relay that has a short. You will have to change it, engine fuse box.

[@Stevesbe]

@@DIYAutoworksNG thanks for the response It's winter 40 degrees ac is off if i start it and let it warm up the fan is not on till it gets hot it turns on but then won't go off.

[@DIYAutoworksNG]

I see. Is the heat on?

[@Stevesbe]

@@DIYAutoworksNG on or off its the same

[@Stevesbe]

@@DIYAutoworksNG maybe the temperature switch is turning on too low

[@shibarmyburnz1978]

Hey mate My car is overheating replqce a leaky radiator. The temp was reaching 113°C + and no fans on If I run the AC on cold BOTH fans run Do you think it may be this swtich? Or something else which may be causing this issue

[@DIYAutoworksNG]

I think it's the switch or coolant temperature sensor since you said that the fans turn on when you put on the AC. Check the cooling fan relay though..

[@shibarmyburnz1978]

@@DIYAutoworksNG Thank you very much for the repyI appreciate it legend The relays seems okay and fuses seem okay. Fan harness and connects seem to test okay Additional testing after testing all fuses and relays The fans do turn on around 105° Celsius+ (ECT temp on scantool livedata) and turn off around there too around 105° Most likely cause will be my switch? (Located in radiator fan next too out large coolant tube at bottom) As Temp sensor is reading correctly? (I believe) and matching dash reading Does this sound like the right path? Or would the Thermostat be the issues at all? Opening too late? When running idle the top coplang hose will get hot and the bottom one will take some time to heat up usually can hold it for a while but does heat up and get hot at a point. ^ would that indicate the Thermostat is okay (normal operation) or not okay Water pump seems okay as hot air will come out of aircon

[@DIYAutoworksNG]

Is this a 7th gen Accord?

[@shibarmyburnz1978]

@@DIYAutoworksNG Accord Euro 2006 CL9

[@DIYAutoworksNG]

I'd replace the one on the radiator plus if there's another close to the thermostat. Will also replace the thermostat as part of preventive maintenance given the age of the car. This is if the thermostat has never been replaced.