ponte trucha: To check your fan jus turn you A/C on. If it turns on the fan works. Then check your relay and thermostat.
Tony Lozzi: Thank you for the info. Video is very informative.If the fan does not turn on by jumping straight to the battery does that mean the fan is bad or could it be something else? Thank you again...
Armando Monsivais: nice video and simple to fix some common problem thanks man.
Jose Davila: You my friend are a genius . Thank you.
joe guzman: I changed both my radiator thermostat fan switch my relay works and my fan works I changed the thermostat a year ago and my fan still doesn't turn on when the car starts to heat up any suggestions would be appreciated its a 98 honda civic d15b 1.5 non v Thanks
richard urieric: wow very easy way of checking, good video thanks
Suneel Bhalgaria: when i bypass the radiator fan switch with a jumper wire then only the radiator fan comes on. Can you tell me where is the problem. i changed the radiator fan switch still the same problem.
Jinglei Cai: Sir, do I have to drain the coolant before I remove and replace the radiator fan switch?
benny pelayo: good help man thanks
Donny C: Thank you so much man i figured out it was the relay from your video! I had ro really dig youtube to find this.
Joey Butor: any other reasons why a fan won't work? iv done the tests and its came on and iv done the thermostat and that sensor on the thermostat I don't know what it is but it won't come on
Monstrosity Sound Inc.: The relay look different but you can test with the others they plug right in and are wired the same way to
jcastle003: Great video! I have a 93 Civic and noticed the radiator fan wasn't switching on. I wired a manual switch (instead of the paperclip). One wire on the temperature switch connector goes to the relay and the other goes to ground. So I wired the relay connection to my manual switch inside the car and the other side of the switch to ground inside the car. I only turn on the fan when the car is up to temp and sitting at a stoplight. I switch it off when I get going over 30 mph.
One of the biggest reasons these engines blow head gaskets is due to overheating. And a common reason why it overheats is failure of the thermoswitch.
Keep the vids coming!
Costa Junior: I've got a Honda Civic Si with a brand new radiator. The radiator coling fan works well for around 5 kilometers or so; then, it just dies, and the temperature rises quickly. After the car's engine is cold again, I turn it on and the same repeats. What can be wrong?
kobe0834: if your cooling fan doesn't turn on, the problem is very likely NOT the thermostat so u can prob cross that one off the list, the thermostat is very easy to check ... if its stuck in the closed position your car will overheat very easily within a few minutes because the cold coolant from the radiator is blocked from reaching the engine, and if its stuck in the open position it will have no effect on the cooling fan or fan switch, (the car will just take longer to warm-up) your engine should still heat up then activate the cooling fan switch at the proper temperature, that leaves the cooling fan switch as the most likely malfunction
Daniel Lopez: ive done everything in ur video and replaced the cooling fan switch fans still wont turn on it will only turn on with paperclip help please
tri pham: hi, i have a question if you can help me. i check my new radiator fan switch and even with cold or hot. they have little to no resistant.???shouldn't it be open unless temp go high enough then it close.?? however even with that, my fan does not come on unless i turn on AC. and yes, i check the fan motor and relay and they also seem to be fine. (just replace coolant temp sensor as well) what could it be do think?? it is for a 1996 toyota camry 4 cyn . thanks
cadw600: soo what was your problem? and what did you replace to fix the problem? I just bought the Thermo Switch $40, gonna replace that when i have the time. At first i thought it was the relay.
Danny Martinez: when you turn on car is radiator fan supports to turn on? My car has never over heated but I never see fan on when I open hood
Radiator Fan / Relay / Cooling Fan Switch Not Working: Honda Civic5
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