How To Test and Replace A Radiator Cooling Fan Switch

This is a short video on how to locate, remove and test the radiator cooling fan switch on your vehicle. The cooling fan switch simply activates the cooling fans to turn on, typically around 195 degrees F. A faulty switch can cause the engine to overheat.


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Note:
Any attempt to repair automotive parts and/or systems carries risk of personal injury. Always adhere and follow safe practices when working on vehicles. Such as, safety glasses, jack stands, no loose clothing, etc. No guarantee or warranty is implied. Use the information in this video at your own risk. Carsntoys is a member of the Amazon Influencer Program.

Publication, reproduction or distribution of this film is strictly prohibited.

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[zdrz]

Nice demonstration, but I think it's important to note, as mentioned in some other comments:
- Blowtorch test is NOT definite, as failing switch might close at the higher temperature and cause engine overheating.
- Boiling water is much more precise, and adding a cheap food thermometer can test more accurately for the open and close temperatures, which are sometimes printed on the switch itself.

[amirvissyram]

Very concise and simple to understand explanation, thank you

[Loulito]

Hey CarsNToys, I have a question for you. Maybe you can shed some light on the subject. I had a faulty Fan switch for my 98' Camry and decided to order one from the dealership and it arrived today. I installed it and my car reached 199F and it did NOT switch the fans on. I let the car fully warm up and burped out any air bubbles and drove around and my car went up to 217F when the switch finally activated! But that's too high, the temp needle is a bit above the middle marker. Is it possible to have a bad switch from the dealership? Or should I look at something else?

[dannytrinh]

I would like to chip in something so others could learn as well. I have tested the same way as demonstration and it beeps as it should since my switch is working. However, my switch made that connection at 214 degree (sometime 217) which is a lot later than specs allowance and that is where all the trouble come from. The temperature gauge starts climb over half mark. So pay attention there as well. That was what I call half a$$ working switch and it must be replaced as well if you don't want your car overheating.

[samsudeen]

You explain very patiently and in a clear manner. Please post more videos about Ford Fiesta.thank you very much.

[yaakcon]

MAN!! I LOVE THE WAY YOU EXPLAIN IT. IT IS SO CLEAR AND SIMPLE. THANK YOU. I HAVE 2004 HONDA PILOT AND BOTH FANS ARE NOT WORKING NOW.

[MariaGonzalez-eipv]

Why did you replace that switch ?what was the symtoms you had?

[Eurospec]

Excellent video, thanks for sharing. When you say, set your meter to the continuity setting, What symbol exactly on your dial do you switch it to?

[jeffcrookes]

Thanks for the very informative video. My temp switch is self grounding so only one terminal. How do I use the multi meter for that? Thank you in advance!

[rjlinnovations]

Much appreciated for your video tutorials 🙏

[RAFICKDAMISONMOYO]

Fantastic video boss, Gain hands on experience

[vajaynunthandass]

Very good. Makes me want to get back into the rat race again

[billyluu]

It’s very awesome video. Thank you for uploading this video. I can go test my radiator coolant fan switch. To see it . Is it working properly?

[jdmforever]

You can also take a short piece of wire and touch both connections on the plug and if the fan comes on you know your switch is bad

[theRun]

Great video, thanks a lot. Helped me fix my Honda Civic.

[cenury]

Why would you do a jump cut between lighting the torch and when the meter indicates continuity, if it only takes a few seconds? All that does is make it more difficult for anyone trying to emulate the test method that you're demonstrating.

I appreciate that you're trying to help people with this video. Otherwise generally good info.

[SirRamone]

F22 In a CB7 the switch is located on the top radiator hose to the block I believe

[nanasakyi]

Thanks for the video, I want to know if this this test is ok for 2014 Dodge Journey coolant temperature sensor

[xmm]

I tested one for my Toyota Camry and it has continuity all the time even when it’s cold 🥶 any suggestions?

[splashyreacts]

Thanks for this. What should I do if the fan still doesn't work with a brand new switch and fuse? It turns on when I fiddle with the switch but then it turns off again a few seconds later