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cooling fan doesnt turn on....

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    #1

    cooling fan doesnt turn on....

    so my cooling fan lets my radiator fluid boil up in my overflow tank and you can hear it from the actual radiator... i've already changed a sensor and thermostat yet my radiator still boils. i only used 1 gallon of fluid so its Under but i dont think that is the problem. Could possibly be a relay? i saw the relay under the hood called "cooling fan relay" - could that be blown?

    i dont know what to do now

    Be Clean
    Tags: None
    #2
    does the fan turn on after you turn off the car???

    have u been overheatin??

    turn on a/c and c if those fans turn on?? both??

    i have a similar problem also, my fans work but i thinks a sensor, it turns on after i turn off the car but when it idles it does not turn on...

    Comment

      #3
      Originally posted by sackingz123
      does the fan turn on after you turn off the car???

      have u been overheatin??

      turn on a/c and c if those fans turn on?? both??

      i have a similar problem also, my fans work but i thinks a sensor, it turns on after i turn off the car but when it idles it does not turn on...
      when i shut it off, i can hear it boil and i have to restart my car and turn on A/C to turn on both fans.... it doesnt want to turn on by itself. could it be a relay? i've already changed sensor/thermostat... and should i just fill up my radiator tank to a normal level?
      Last edited by nostringz; 10-01-2006, 12:03 PM.

      Be Clean

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        #4
        yeah but a 50/50 mix of coolant and water in the radiator if your low on coolant...

        so are u leakin also??

        do you see some coolant on the overflow tank??

        edit: or by the overflow tank??

        Comment

          #5
          when it boils, feel the top rad hose and then feel the bottom, if the bottom is colder than the top significantly then its ur thermostat and ur fans wont come on cause there is no flow to them.

          that happend to my z...yet if they are the same temp then its something else like a relay or something.
          What makes me laugh about forums, is that no matter how much you try to help someone, they dont take the advice. Go ahead and do it the hard way.

          You got to respect what you drive, and appreciate what you have, making the best of what you got. and if that means putting CAI, HID's, a phat stereo system, and a idiot in the drivers seat...then so be it!

          Retro!

          Hater

          I love nooBs...They make me look good

          Comment

            #6
            nah no leaks but i will try that hose thing if its boiling. lucky i didnt fill my overflow tank because if it was boiling it would've overflowed past the cap and sprinkled under my hood. im guessing its my relay although i have to run more tests! thanks guyz...

            Be Clean

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              #7
              I had the opposite problem, the cooling fan would turn itself on all the time, would run until the battery died. I bought the car with this problem lol. It wasn't the relay, i forget what it was called....a little box the Honda dealer wanted $400 for. My mechanice got it for $40 from the junkyard .


              Sean-Dinner.com

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                #8
                It could also be a temperature switch... Most likely the relay though if it NEVER works.

                Comment

                  #9
                  Originally posted by nostringz
                  ... i've already changed a sensor ...
                  There are two, one for each fan since they come on at different times. You sure you replaced the correct one? Or if the sensor is good how about the circuit it's on? A Chiltons or Haynes should have diagnostic steps so you aren't just replacing stuff left and right.
                  >>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

                  Comment

                    #10
                    Originally posted by accordztech
                    when it boils, feel the top rad hose and then feel the bottom, if the bottom is colder than the top significantly then its ur thermostat and ur fans wont come on cause there is no flow to them.

                    that happend to my z...yet if they are the same temp then its something else like a relay or something.
                    ok if theres no flow to them than what should i do? i made it boil today and i the top hose was hot and the other hose felt like there was nothing in it... does it mean i need a new rad?

                    Be Clean

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                      #11
                      Originally posted by nostringz
                      ok if theres no flow to them than what should i do? i made it boil today and i the top hose was hot and the other hose felt like there was nothing in it... does it mean i need a new rad?
                      thermostat is bad, not letting water circulate through the motor.

                      change that, since your at it and ur hoses arent the best change those too.

                      ..if you think that its not the thermostat then do a search on thermostat and you will be able to see what others have gone through.
                      What makes me laugh about forums, is that no matter how much you try to help someone, they dont take the advice. Go ahead and do it the hard way.

                      You got to respect what you drive, and appreciate what you have, making the best of what you got. and if that means putting CAI, HID's, a phat stereo system, and a idiot in the drivers seat...then so be it!

                      Retro!

                      Hater

                      I love nooBs...They make me look good

                      Comment

                        #12
                        There are 2 temp switches on the car. The one at the front (on my car) is the emergency one. If it gets too hot, it will activate BOTH fans at the same time. The one in the back by the thermostat is the normal one that operates the fan at normal temps.

                        Sounds to me like a thermostat problem instead of a relay/fan problem though. Because a bad thermostat will also keep your fans from turning on... Good luck.

                        Comment

                          #13
                          Which thermostat controls the temp needle inside the car, if one goes out does it start reading from another, or is it displaying both at the same time?

                          Will's Accord

                          Comment

                            #14
                            The gauge is controlled by the coolant temperature sensor, that sensor isn't on either water outlet, its actually located on the cylinder head, right under the dizzy.

                            Comment

                              #15
                              i have a new thermostat and sensor - i forgot the name of the sensor but i know i got the right one from my handbook

                              Be Clean

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