Announcement

Collapse
No announcement yet.

Aux fan/temp switch questions

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Aux fan/temp switch questions

    My understanding of the temperature switch and there function:
    When the underhood temperature of the car reaches a set degree the aux fan kicks on to keep the car cool, (if the temperature gets even hotter the fan kicks in too a second level?) when the temperature returns to a normal level the fan switches off.

    My car
    When my car overheated friday, then again on sunday my aux fan never came on, however it does work since when I turn my ac on it blows plenty of air.

    My theroy
    This leads me to belive my aux fan thermal switches do not work.

    Is there any way to test them other than forcing my car to overheat then hoping they turn on?

    I would like to have my electric fan run most of the time, aux fan run when nessecary, and engine not blow up.

    switches, relays etc are still a little over my head. (Audio systems however are not go figure.)

    Sold it.

    #2
    bump thread revival, i'm confused with this also

    Comment


      #3
      You are correct. They are two speed fans. It should run low speed when a/c is on.
      Maybe take out the switches and put em the oven at 225deg.
      check em with ohm meter .
      You can unplug the wires from the high and low switches on the radiator,run a jumper between wires and fan should run.
      Even better, rewire it to the dash ,next to hazard switch and manually turn it off and on/high low.

      Comment


        #4
        i would like to have them turn on automagically, i'll search around the tread some more without the ac being on since i deleted it. thanks

        Comment


          #5
          So, the fan clutch is supposed to run on high speed all of time regardless of temperature, while the auxilary fan cuts on according the the thermo switches?
          Last edited by brandondan1; 10-15-2006, 07:51 AM.


          91 318is

          Comment


            #6
            i'm not trying to insult you, but maybe youre mistaking the fan clutch in the engine bay for the fan in front of the radiator?

            Comment


              #7
              I dont have my ac hooked up but I hit the AC button every now and it turns the fan on low to keep the temp in check.


              http://www.cardomain.com/ride/657387

              Comment


                #8
                hmmmm mine doens't spin at all, i think its dead, damnit

                Comment


                  #9
                  Originally posted by tonytony View Post
                  hmmmm mine doens't spin at all, i think its dead, damnit
                  There is a low speed resistor. Probably just needs to be changed.

                  There are 2 fans on the E30. A clutch fan that works off the radiator temperature, when the air gets to a certain temp, it locks the clutch fan.

                  The aux fan is based on a temperature switch in the radiator. If you use the A/C button to turn it on, this in effect overrides the temp switches.

                  Comment


                    #10
                    thanks trent i'll check that out

                    Comment


                      #11
                      Originally posted by luvin my 325es View Post
                      Maybe take out the switches and put em the oven at 225deg.
                      No! Try this. Grab a coathanger, a candy thermometer, a 2 quart pot (1/2 full of water, boiling) a voltmeter and your switch.

                      Bend a loop at the end of the coathanger to attach your switch, so you can dip the end of it in the boiling water. Check your switch with the DVM set to continuity. You should see the switch close at 190°f.

                      Luke

                      Closing SOON!
                      "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

                      Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

                      Thanks for 10 years of fun!

                      Comment

                      Working...
                      X