How a Cooling Fan Switch/ ThermoSwitch Works
HTML-код
- Опубликовано: 21 фев 2014
- This video shows how an normally-open cooling fan switch works. I also show how I tested my cooling fan switches. the switch turns on at 203 degrees Fahrenheit. The switches came off my Honda civic 93
Авто/Мото
Wow for the slightly lower level of quality of this video i wasnt expecting much but you did a fantastic job in demonstrating the science behind it pretty well and clear, I actually learned more then i expected, great job man!
Smack Cho
Wow thanks for this well explained video now I understand why my radiator fan don't turn on automatically. My mechanic connects the fan direct but now I can fix this issue. Thanks again
Nice demo. My Honda has several switches like those, including an elusive one that makes the fan blow air across the engine block after the key is turned off but damaging heat still needs to dissipate.
This is a great video. Thank you so much
Very useful and well explained.
Thank you.
Tanks bro that was great
The Paletero man at 2:35 LMAO
Good video btw
Hello, great video but i have a little question. I am not good at multimeters :( Our EP90 starlet has a cooling fan that has never come on in months. Down to my basic electrical knowledge I decided to stick a piece of wire in the wire clamp that fits in the switch and rubbed the other end to the engine block and the fan went on. does this show that the switch is dead? (the switch has only got one terminal so i think the circuit is open when the bimetallic part is not touching the housing which in turn touches the engine block. when it gets hot it touches and closes the circuit) is this a good line of thinking?
Great video
thank you
Hey bro not sure if you're still around but thanks for this vid and info. I just got into cars recently and I've been learning a ton. Do you happen to know what this would look like if the thermoswitch has 3 prongs? My VW has 3(separate hi/low speed) and I've been trying to find info on how that would work compared to this usual 2 prong switch to no avail. Would it just have an extra bimetallic disc? Very interested in finding out. Hope you're doing well!
What year/make car did this switch come from?
Where is the thermo cooling fan switch located on a 1998 Chevy lumina LS 3.1?
Thanks man
no hablo ingles pero vi su vídeo...ayúdeme con algo ..tengo un instale un thermo switch y sube la temperatura ..me da continuidad con el multimetro ..pero no me activa el relay ..lo saco dejo los cables conectados ..le caliento con fuego igual me da continuidad pero ahí si activa el relay ..que puede ser ??
is that from Honda civic si
Roy Johnson I would make sure the fans have a good connection by wiggling the wires ( car will be hot so be careful). I doubt that the switch is bad. For some reason there is no reply button by your comment. I hope this helps
SnagEasy I jumped wires before switch and fan turns on and I tested switch and get a reading, could the switch be bad even if it had a reading?
I found my switch was bad by disconnecting the fan connector and jumping the two leads with a paperclip my fans turned on which told me the fan switch was bad. the test in the video can be helpful however you could still have a faulty switch if it engages at too low or too high of a temp. the switch needs to engage at a specific temp just like your thermostat, a cars fan cooling too much can be just as bad as a fan not cooling enough.
thanks for posting this. im pretty sure this has gone bad on my 99 accord. my rad fans only come on when the AC fan is on. If i short out the fan switch with a paperclip, they come on properly.
do i need to drain some of the rad fluid or can i just swap these out?
Did you drain fluid? Wondering same lol
so this is why my radiator fans takes like a minute 3 seconsor more betwen each cicle????and did ypu repla e the senssor .. can you tellme if it makes any diference????
looks like they maybe open and close the 'gate" to Ground through the switch body...
hi and thanks, can you help me out , i have a question,,
do the switch makes the fan run slow if its bad, because when i check the fan directly with the battery they work perfectly fine , but when i plug it in they run slower
thanks again
Most likely, no. Although it is certainly possible with corrosion, a thermos switch usually gets stuck "ON" the or "OFF" position when it breaks.There are some thermos switches that have two modes (slow and fast) and usually they have 3-4 pins depending on your car. if you test the resistance on the switch you should get a similar reading on your multi meter, about 100 ohms would indicate a good switch. Hope this helps
Thanks for the video.. So I’m guessing that a “switch” is not the same thing as a “sensor”, right? I was trying to order a coolant temperature sensor that has a longer dip stick and they gave me the thing in this video.
people use the term interchangably and i never understood why. in reality the main function of the one i show in the video, for my honda specifically, is a switch. there is another sensor that is on the side of the engine block that changes resistance. that info is converted onto your meter on the dash for the driver to read.
Fan was not working on the honda city 2008 I was driving. Fan turns on with the air-con on though, so there's that option to not overheat. Diagnosed the problem using your tutorials. Either the switch is bad or the thermostat (doubt it's the thermostat). I will pull out the switch later and test. Also will buy a replacement switch later. Thank you for your videos.
excellent! thanks for the input.
excelente trabajo amigo
hasta llegue a partir uno a pedazos por curiosidad y muy claro no me habia quedado, porque este tenia no una si no dos de esas chapitas redondeadas maybe se separaron cuando las cague a putazos, era de autozone y salieron malitos no una si no dos veces, hasta que lo compre en otro lugar y funciono como debia
ahora entiendo porque si se le mete un cleap a la conexion el ventilador se activa.........
muchas gracias
i have problem , already second termoswitch have died on me. what could be the problem? i have and old car and i like to do some rally stuf . I use calorstat by vernet termo switches . plz help
+cidoXL you dont need the thermostat, just take it out. your heater wont heat up to fast but your car will always run cooler
Replace your fan relay
but how do the ones with only one wire work ?
how can you open and close a circuit when it does not have an in wire and out wire..(as your examples and diagram seem to have) ?
Countdown70s single wires have power coming in from that wire and the ground is the body the switch. The switch is connected to the engine and the engine is connected to the chassis.
do you know the difference between a green and brown color cooling fan switch,on my car is green, but I can only find the brown color one.
Temperature sender/sensor usually is only one green wire
so this explain why my fans takes more than 1minute 40 secons bewen each cicle????
What do you set your multimeter to?
20K Ohms
My switch turn on 100 c and I boiler the switch about 1-2 minutes befors switch turns on. Its correct?
Yes that's ok
when u changed the fan switch did u need to bleed the radiator
art barragan it is advisable to bleed the cooling system :)
can the switch stay on when car cools
Thomas Romey short answer, yes. If you assume other components are working (relay), if the switch was stuck on the "ON" position the fan would be running the next time you run your car after your car has completely cooled. The good news is that this can be easily checked. All you have need to do is determine if you have a "normally open" or "normally closed" switch and test for continuity.
This is why I'm wondering,why my cooling fan is working when my engine is cold but whe it's hot the fan stops.Or after using 30 minutes when I turned on my car again my fan has no responds.
some work opposite yu have to know that
wow how crazy you do a test on thermo switch. hope someone understand what are you talking. a simple advise dude have a temperature gauge dip in that hot water so you will know at what temperature the thermoswitch is on. ！！ok...
out of focus