Overheating Help! | Testing Cooling Fans - Relays - Connections

If your vehicle is overheating due to a non-working cooling fan motor, this video will show the steps involved in diagnosing the problem. Cooling fan motor testing (low and high speeds), relays, harness connectors...it's all here.
Generally, the low speed fan kicks on when the A/C is turned on or when the coolant temperature hits around 200 degrees F. High speed kicks on around 220F.
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Note:
This video is being performed by an experienced tech. 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, use safety glasses, jack stands, no loose clothing, etc. No guarantee or warranty is implied. Use the information in this video at your own risk. If you don't think you can perform the job then be smart and don't. Carsntoys is a member of the Amazon Influencer Program.
Publication, reproduction or distribution of this film is strictly prohibited.
Overheating Help! | Testing Cooling Fans - Relays - Connections
• Overheating Help! | Te...
Ending Music: Rusted Feathers by Silent Partner
Carsntoys
/ carsntoys

[@stevenbryce6269]

Excellent video! Big help! However, I wanted to add something to it that I found out in my 72 hour overheating diagnosis. HOPEFULLY, it will save someone else a lot of headache. I spent 3 full days researching what my problem was. 2014 Mustang V6 was operating fine UNTIL I turned on the AC; then it would overheat. I popped the hood and realized that the fan was not running when the engine reached high temp. I tested the fans, relays, fuses per your instructions - everything checked out (SO I THOUGHT). The actual problem was the Fan High Speed relay. It had continuity during testing with 12v and multimeter; but failed under the actual load in the vehicle. SO, I strongly suggest that if you hit a brick wall; swap out the relay with another working relay (in my case it was the relay for the starter). Soon as I swapped it out, the starter was dead; switched back and it was fine. Bought a new relay for $21 with lifetime warranty and I have been good to go! Hope this helps someone!

[@yperalta0809]

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[@sydneylightfoot7715]

]

[@DOOM1715]

This is an excellent tip I learned from my old school mechanic neighbor when I was a kid

[@UnratedMinds]

I tried testing the relay just by switching it with another of the same in my Subaru Outback. Everything was still fine so I figured it wasn't the relay until a couple days later my wipers went out because that's the relay I replaced it with.

[@dshook1989]

What one was it

[@neomatrixfree3627]

I have been terrified of my cars overheating issues for years. Your videos are the first ones ever to make sense of it all. I have yet to find my multi meter, but once I do, I will be following your instructions religiously. I appreciate your help more than you may be able to imagine. Fear of things electronic has kept me from trying...and I am otherwise not afraid of much! Thank you so much!

[@billbernhard3582]

Excellent diagnostic, here ! Clear and simple. 1st, check the fuse ! Also, in a pinch, you can swap the #1 relay with one of the other relays on the same number designation. Swap the two & see if your fan issue is resolved. #1 relay should hold the coolant temp at ~ 190*F, even on a hot day.

[@catfishcain]

Well explained with great camera angles. By far one of the best automotive repair videos on KZbin.

[@CarsNToys]

Thank you. Appreciate the feedback.

[@warriorsforfreedom3971]

​@CarsNToys so on my 2001 acura mdx, the fans are not turning on and the temperature Guage is reading normal but if I pull the relay out, which I tested and is fine, if I take a test light and connect to ground and touch the test light probe to where the relay plugs in, the low fan turns on. What do you think it could be?

[@hugh3rdof5]

Truly helpful video. You cover so much more than other sites, yet in a clear, professional, calm matter. (Thanks for helping us with the electrical wiring diagnostics....) You just earned another regular follower.

[@ronnieatticus8455]

Sorry to be offtopic but does someone know a trick to log back into an Instagram account?? I was stupid forgot the login password. I appreciate any assistance you can offer me.

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@Ronnie Atticus instablaster =)

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@Hugo Cristiano thanks so much for your reply. I got to the site on google and Im waiting for the hacking stuff now. Looks like it's gonna take quite some time so I will reply here later when my account password hopefully is recovered.

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@Hugo Cristiano It did the trick and I now got access to my account again. I am so happy! Thanks so much, you saved my ass!

[@hugocristiano928]

@Ronnie Atticus glad I could help :D

[@locotx215]

In less than 20 minutes, I learned about troubleshooting my car radiator fan. Such an educational video and the presentation was spot on. Great job my friend!

[@CarsNToys]

Thank you. Appreciate the feedback.

[@ntbzero7]

Thank you so much for such detailed information. A lot of videos discuss only one issue assuming that you already know the problem. You have created a step by step instruction to diagnose this issue. Perfect!

[@abujamiylah]

I really appreciate the time you put into this and the methodical way you explain step by step so clearly. I can't wait to get started tomorrow on mine. my Pontiac Montana overheats because the fans don't come on and the connectors to the heater hoses in the back became brittle and finally cracked. I purchased it old but after all the work of putting all those hoses back on, you made this seem like a piece of cake by comparison. Thanks again

[@andrewandrew4446]

Most informative but simple video on this topic that I've found! 👏

[@novisnick6928]

Thanks so very much for the education! I couldn’t think of a better teacher. God Bless you

[@husseinlodhee2357]

You are a Genius MAN...Never seen a video like this before Sir..Thanks

[@stephenlungaro6394]

Very informative and covering all trouble shoots. Thanks and keep it up

[@robestey5628]

Thank you so much Sir. Just an excellent video tutorial. I am a newbie and absolutely loved your teaching technique with in-depth explanation and visual. I am now your student. Thanks so much again.

[@CarsNToys]

Appreciate the feedback and I'm glad to help.

[@raymondward3073]

Great video, you explained things so thoroughly and easy to understand. Awesome! Great job and thank you

[@johnbirk843]

Most helpful description I have ever thank you so much. There was one little thing, if there is no voltage it is not a shark, it's an open, a short with blow a fuse or cause wires to burn. It's a tiny issue and it may avoid explnig it. That said many many thanks, you are the best I have heard at the many hours of searching. Best wishes antiguajohn In apresiation I was going to email you a Pina colada from here on the beach ( while watching the topless ladies walking by). Unfortunately for some odd reason it has been disabled on this planet, work perfectly well on Star Trek 😂 Thank you and best wishes. antiguajohn

[@kirara4953]

This video has a ChrisFix amount of detail, straight to the point. I like it

[@VGMStudios33]

Fuck Chris fix! Hate that guy.

[@kirara4953]

@@VGMStudios33 You don't like simple repair videos and wooder?

[@jacobsamson257]

Ya agreed he's lame

[@modman731]

Thank you for a very thorough explanation to testing the radiator fan. It was knowledgeable and entertaining. Take care.

[@Mista_Godfather]

In older cars you can connect the switch directly to fan/s by using fuse panel so if they don't start (which may happen due to bad thermostat) you can turn them on manually. Hope that this helped someone

[@michaelcordero5588]

I like this guy. I can understand and pay attention to everything and my attention deficit disorder doesn't even bother me.

[@e.la.emusically9762]

How do you know

[@e.la.emusically9762]

Duh

[@iqthunder1]

I've seen many videos on this to test and solve my fan problems, but never like this one. Thank you so so much.

[@tetesukkosodok5469]

Like everyone else said, very informative and very well explained. Learned a lot. this is what KZbin is about. thanks

[@ryan3390]

Best video I found on KZbin for not only testing the fans but troubleshooting the whole circuit. Thank you very much, I will keep this video in a playlist to refer back to when needed.

[@CarsNToys]

Thank you. Appreciate the feedback.

[@raulplaton3512]

Ryan McGui

[@hoagybob]

One of the best videos addressing this problem. Great job and thanks for your efforts here!

[@CarsNToys]

Glad it was helpful!

[@froglegs4910]

Very Very Good ! You are very smart ! Very logical and Very Helpful ! You are very good Auto-Professor !

[@sheilascott7688]

SUN NETOR k

[@raworthyel3786]

Excellent job you explained the multimeter operation, I finally get it.

[@mohanjaglal1377]

Great job! Thanks for giving us a detailed and informative video. Sound troubleshooting techniques. Awesome.

[@Alex-sd6mc]

Perfect video. You were concise, no bulls***, and was very specific. Thank you!

[@everardocamacho5063]

Thank you , great video as always, I like to learn from you videos, cheers from ontario calif.

[@CarsNToys]

I appreciate the feedback and glad to help.

[@alfredosales-staudinger9370]

thank you for your time showing steps to take to help individuals like myself. BLESS YOU...

[@cwm7930]

I learned so much that could be applied to not only this issue but so much more. You're a life saver for us shade-tree mechanics.

[@CarsNToys]

Thank you. Glad to help!

[@showme20able]

@@CarsNToys if you can show us remote start installation that would awesome, a lot of us would like to know .

[@reybitz74]

I like this video. Clearer, simpler and direct to the point.

[@CarsNToys]

Hope it helped.

[@hcic8738]

Perfect Bleeping video my friend. Explained everything in excellent, easy to understand fashion!!! 👍🏼👍🏼

[@estebanserrano1303]

Great instructions. Thank you. Don't know why you don't have a million subscribers!

[@Daily_verse_20]

I’m so thankful for this video and the time you took explaining everything is great detail!!! Thank you !!!

[@davedeatherage4902]

Thank you sir; helpful info: I appreciate it. Went through low speed fan on the blink. 👍👍

[@CarsNToys]

Excellent!

[@hamadali5062]

He is really explaining very good. Thank you very much

[@timetryp422]

Very comprehensive explanations!

[@sunilayya8948]

Superb presentation. You are a great teacher. Subscribed. Even in cars with a multiple speed Single fan , the low speed function can break early and slowly destroy the ac compressor and then the entire system will have broken parts of the compressor circulating.

[@alanthomas3531]

Extremely well done! Thank you.

[@joseburgos5106]

Super explanation. Thank you for sharing and your time putting this together for everyone. Great job!

[@chuycruz8506]

Thanks for this helpful video👍

[@ParisEnterprise]

this guy legendary mechanic. i learn many things from your video bro. thanks

[@georgeyounger1]

Well done!!!!!! thank you very much for the detailed troubleshooting instruction

[@vetter9284]

Thank you for the excellent ninformation and explained in simple terms for average person to understand!

[@deronaldbaggett3828]

excellent video! Really like the thoroughness!!!

[@ll_distribution]

Nice! Thank you for taking the time in making this video editing and all fantastic! I'm troubleshooting overheating myself saves on garage cost and get me in the know! Please continue new subscriber here :)

[@azvasamusic7095]

This is the best vid out there for the info provided Thank you

[@eugeniojimenez4140]

Very well explained theory in actual practice. Commendable knowledge, to say the least. Thank you.

[@iftikharqureshi654]

Excellent clip. Even a layman can benefit from it.

[@emtp1013]

Excellent video. Thank you very much for this!

[@saltycreole2673]

Thanks. Well done video. My daughter took off with my continuity meter in the truck..., my fault. Wait 2-3 hours, have a cool drink and lunch. All good. Thanks! By the way, I'm diagnosing a 2001 Honda Accord. Only one fan relay. Makes things easier yeah? Lol!

[@forhisglory700]

Dude, you're amazing. Such a straight forward video that even a simpleton like myself can get it; thanks. On my way out to buy the multimeter. 🙂

[@Mike_44]

Awesome video! This is exactly what I needed. Thank you

[@lekonarodrick6821]

i like your procrdures,great job and thanks for the time

[@leodeboca]

Thank you very much, very good training!

[@karlanavarro7277]

Great video. Very helpful. Thank you

[@2121heatherh]

You're awesome! I used these steps to diagnose my issue

[@olen2808]

Good Job, for this video detailed Explanation. THANK YOU.

[@roshglock]

Excellent video! Thank you!

[@laurawalsh270]

Extremely informative. Brilliant.

[@tomassoyweyvon4902]

great vid, very helpful, thank you

[@bmarian9357]

Every thing you need in to one video.nice job you are the best

[@randomperson-gy5ee]

Best video I’ve seen on this subject.

[@train4905]

Dear sir,an absolutely brilliant video.very Helpfull indeed,thankyou kindly.steve from the uk

[@adamschneider2481]

Thanks for a straight forward video. Very good teaching my friend. I subscribed to your channel. Thanks again.

[@klaasbonsema5489]

Thanks this is very helpful information.

[@molly8-206]

great information, I will test my prius based on this vid. I really appreciate it

[@christophergranbery2707]

Very well done. You sound to be a patient man. Youd make a great instructor.

[@CarsNToys]

Thank you. Appreciate the feedback.

[@andrewwu8252]

Thank you for your very helpful vid. I was able to fixed my overheating problem today! Your vid is straight forward and to the point! Kudos bro!

[@CarsNToys]

Thank you. Glad to help. Cheers.

[@tnamen1307]

@@CarsNToys With key at ON position, 86 of the C/Fan Relay has 12 volt, and 85 had 1 volt respectively. This relay sits on the engine compartment box. Now, my issue is that as a test light bulb with its one end connected to 86 and other end to ground, the bulb did not glow. Same case for testing a relay. In both cases, the voltage across each loads is about 3 volt. Why is this happening???

[@francisdsa6790]

Thanks for very good explanation and demonstration 🙏👌👍

[@kingofkisses2008]

Well done, so informative and covering everything from A to Z. Thanks a lot for sharing and keep it up. 👍🏻 👍🏻 👍🏻 👍🏻 👍🏻

[@lubuulwafrancis8637]

very helpful video thank you so much

[@Kelly-GrantWolfenden-ye2bb]

Best video I've come across, thank you sir

[@tahirriaz74]

Very good and complete video on fans

[@mattbrown2197]

Great video! Used this to fix my radiator fan assembly in a 2004 Murano. Thanks!!!

[@CarsNToys]

Glad to help.

[@jonanderson6882]

Ourstanding job on this one. Very impressed. Thats saying something from me.

[@martinl555]

Thanks! the way you explain thing are excellent !

[@Ducklesworth]

This is the video i have been looking for

[@njmndoda8216]

Thanks for your good explanation bravos

[@jcammerota]

Great video! Well done. Thanks!

[@MarkInLA]

Whether or not I can test my secondary fan on my 1982 MBZ 300TD this way, or not, I still appreciated this well done explanation.

[@CarsNToys]

Thank you. Appreciate the feedback.

[@josezerpa7815]

Thank You!! Great video

[@bluebox212]

Dag! You just got me as a subscriber. I like the fact that you are comprehensive in your tutorial. Thanks Chris

[@CarsNToys]

Thank you. Glad to help.

[@MrAlcmj]

this is the first time iv ever understood using a multi meter and wiring, thanks

[@corrysmith]

Great video. Very informative. Thank you.

[@Defectordrunkzone]

You earned yourself a subscriber Thank you

[@JOKERBABYG]

Good video thanks for sharing 👍

[@jennifermorales7787]

Great video, even an old lady like me can understand this. 👍 Thank you!!👋

[@maldridge7630]

Thanks, excellent way of explaining things 👍

[@Justicejamesb]

Great video, thanks for the help!!

[@irfanbeig4800]

Great explanation!

[@jontorr2860]

FANTASTIC video!!! Thank you for making it! So educational. :)

[@rongriego9167]

Very informative. Thank you

[@joemarsinapalsinapal]

thanks so much bro. you doing very well.

[@isidoremartinez2529]

Great video gave me a lot of info and knowledge I have a 2014 Jeep wrangler Over heating fan looks like running slow now I can go forward

[@HATTAFRASHED]

thanks for your efforts impala 2012 no blown fuse all relays good fans not work only with scan tool using active test please tell me about the problem

[@wyeshyes2087]

Dear SIr, Your video is very well explained and is well detailed many thanks

[@CarsNToys]

Thanks and welcome

[@rube_shoots]

Very comprehensive, step-by-step how-to. This guy is great. I absolutely hate it when other yootoobers post "how-to's" and just point at something something and say, "I took that off, put the new one in, it worked and that's how I did that. Thanks for watching! Ahyuk!"

[@CarsNToys]

Thanks, Ruben!

[@looploopy3581]

Excellent video

[@cazadordetesoros5357]

Great explanation! Thanks!