Honda Civic “01-05”Faulty Cooling Fans causing overheating. Troubleshooting 

Try changing the cooling sensor switch.

Having the same problem. Any suggestions to look next. I changed the switch temperature. Is it possible the engine temperature switch?

I’m having the same issue

Any update I’m having the same issues and I’ve replaced the thermostat and the switch relays and fuses are good the paper clip by pass works new sensor switch doesn’t kick the fans on any suggestions?

Make sure you have the correct sensor for your vehicle. There are a few and both look the same. Also your temp has to be high in order to trip the sensor on. Change out the thermostat . Some thermostats have intermittent trouble

I did the same i replaced both sensors, fuse relays thermostat and fans are working except when the engine is running

Did you find out what was causing the problem ? Im having the same issue fan dont turn on. ​@frankdelao280

@@hangman864 not sure but try all you mentioned one at a time to eliminate the good and prove the bad

Okay now its getting hot again lol... this is so frustrating... my fans were just working properly when i changed the fan switch..now its beginning to overheat again because they arent kicking on again like they were... but when i jump the 2 pins it stays cool. Do you have any clue what the issue could be ?

Make sure your thermostat is operating 100% all the time and it’s not working intermittently and on its way out.

@@HighRidgeHandyman .. Will do...Should both hoses be hot?

​@@MAAT21519lower hose should be warm to hot but cooler than upper hose

Testing for people who do not have or use scanning tools

@@HighRidgeHandyman Great video too! I’ll reference this video.

Deep socket

Thanks I ordered on Amazon the deep socket. Appreciate it.

Cooling switch could be faulty , also make sure you have enough coolant in the system. If coolant is low the switch won’t be totally submerged and will trip on and off. Open the cap when cold and make sure the coolant is to the top covering all internals. Good luck

Did you jump the plug to make sure the fans work? If you did and the fans did not come on then check the wiring to the fan motors and the fan motored themselves. If fans work then I would definitely change out the thermostat. The first thing I do is change out the thermostat. Most of the time that’s was the issue is. Good luck be safe. If your not skilled enough ALWAYS HIRE A PROFESSIONAL. Good luck

@@HighRidgeHandyman Jumped plug and both fans come on. Will address thermostat next. And unfortunately don't have the proper equipment to drain the coolant. Thanks for the reply.

It’s called a Coolant Temperature Sensor. If your parts store doesn’t know this find another store bro.

It's the fan sensor switch

having the same issue right now, either clogged radiator or not enough air flow from the fan. when you’re driving it’s pushing enough air

@@Forvs1I’m having this exact problem!!!! Someone pls respond to me if you found a solution my car doesn’t over heat at all even tho the temp gauge shoots all the way up

@@HenryFernandez-nh1jx i had a bad head gasket 😭😭😭

Is the water in the radiator bubbling when car is running its probably the head gasket

@@RobertMorris-l3l thank you no not the problem I found out the person I got it from never burped It so it cause it to over heat now I drain it filled it up burped and now the problem gone

@@veemajeno7511 glad you found it out instead of having to replace the head gasket

@@RobertMorris-l3l right thank you 🙏

When trying the paper clip Try turning the ac on full when you test it. Both should come on. If not check wiring to 2nd fan that doesn’t work

Also check the fan fuses,wiring to the fans. If they are good then most likely the fans

Do this when the car is running?

Jump two wires directly from the battery to the fan plug... They should come on if good, if not it's the fan for sure

No need. Just top off when your complete if needed👍🏻

@@ivanska3099 Sounds like the engine coolant temp sensor is reading incorrectly and could be defective Or you could have a bad fan relay causing the fan to run continuously. Good luck

Same problem. I am pretty confident I bought the correct sensor.

shop.advanceautoparts.com/p/carquest-premium-coolant-temp-switch-aca1517/12541596-P

The after market I bought turns the fans on at a hotter temp. example the factory original turns fans on at 207° and the aftermarket would turn fans on at 225° didn't like that so took it back.

@@mtsbaby414 Coolant temperature sensor.

Fan sensor switch, just bought one

Then the passenger side fan is broken.

One is an ac fan the other is a rad cooling fan, if your ac is off the ac fan isnt going to run

Did you solved the problem

I got the same issue

I'm bout to run these damn fans on a toggle to stay on when im at a stop light to see if that's what cause the car to overheat slightly when at stop lights after driving on highway for 30 mins at 80-90mph

same here. have you fixed it?

Blown head gasket my friend

How did you jump it so the fans are always on?

One is for the temp coolant and the other is for AC. Drivers side id engine coolant and the passenger side for AC. Which ever isn’t working check that fuse and relay.

@@HighRidgeHandyman Did the paper clip the ac fan kicked on but the other didn’t I checked the wiring looks good but what else could be the problem