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  • Electric fan setup/wiring.

    Hi. I recently purchased an M3 that has an electric fan, and "rongineering" electric fan kit (activates fan 5 seconds after brake pedal is pressed). The viscous fan is deleted, I have a CSF aluminum radiator and there is no fan shroud. Sometimes the temp creeps up above half but never over 3/4 when idling.

    I'm thinking of wiring the electric fan with a coolant temperature switch. Any recommendations on this setup (what temperature coolant fan switch, where to mount the coolant fan switch, there is a spot on the thermostat available and 2 spots on the bottom of the radiator on the drivers side)

    Do you think I should install a fan shroud??


    Thanks in advance.


  • #2
    VAC Motorsports sells a nice kit with relay’d wiring harness, an 88*C ‘low temp’ fan switch, and brackets. I think they sell the harness / fan switch sensor searately.

    I mounted mine in the bottom of the thermostat housing and it all works perfectly. Using the included 14” SPAL puller fan with integrated blade guard doesnt require a shroud however if your current elec fan is unprotected a shroud is very nice to have.

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    • #3
      what am i missing....why would a fan be set up to come on when the brake pedal is pushed?

      it should be connected to a switch mounted in the the T-stat.
      88 M3 Henna
      95 M3 Orange
      97 M3 Techno

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      • #4
        Originally posted by mlytle View Post
        what am i missing....why would a fan be set up to come on when the brake pedal is pushed?

        it should be connected to a switch mounted in the the T-stat.
        OK so I am not the only one that made my right eyebrow go up at that?
        jimmy p.
        87 E30 M3 Prodrive British Touring Car
        88 E30 M3 Zinnoberot - Street
        88 E30 M3 Lachsilber - Race (#98 SCCA SPU)
        92 E30 M Technic Cabrio - S14 POWERED!
        98 318Ti M44, Base - Morea Green
        04 Ford F350 - V10

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        • #5
          Yea, what happens if the car is sitting parked in neutral? Go ahead and overheat?

          Comment


          • #6
            http://www.rongineer.com/m3fankit.html

            Thats the setup it has now... I was thinking the same thing when its in neutral its going to overheat.

            Comment


            • #7
              Originally posted by evanboyle View Post
              VAC Motorsports sells a nice kit with relay’d wiring harness, an 88*C ‘low temp’ fan switch, and brackets. I think they sell the harness / fan switch sensor searately.

              I mounted mine in the bottom of the thermostat housing and it all works perfectly. Using the included 14” SPAL puller fan with integrated blade guard doesnt require a shroud however if your current elec fan is unprotected a shroud is very nice to have.
              do you have a link to this kit?

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              • #8
                https://www.vacmotorsports.com/
                88 M3 Henna
                95 M3 Orange
                97 M3 Techno

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                • #9
                  $399 for the full kit with fan, brackets, harness, 88* temp switch: https://store.vacmotorsports.com/mob...-m3-p1773.aspx

                  pic installed in my car:

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                  • #10
                    I contacted VAC to see if they will sell me just the wiring kit + sensor, without the fan. Waiting on response.

                    I also want to replace the hoses with silicone hoses. Any recommendations? Mishimoto hose kit?

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                    • #11
                      there is no magic in a fan wiring kit. some wire. a relay. a bmw t-stat switch. simple and cheap to make.

                      even easier for you. you have it all in place except for the t-stat switch. reroute the "brake switch" wiring to the t-stat switch. done.
                      88 M3 Henna
                      95 M3 Orange
                      97 M3 Techno

                      Comment


                      • #12
                        ^^What mlytle said regarding the re-use of your current setup using a temp switch as the gate control / trigger for the relay

                        As far as hoses go mine are Samco and can be sourced from a bunch of places. VAC sells them for $360 and supposedly have em in stock.

                        Comment


                        • #13
                          Originally posted by mlytle View Post
                          there is no magic in a fan wiring kit. some wire. a relay. a bmw t-stat switch. simple and cheap to make.

                          even easier for you. you have it all in place except for the t-stat switch. reroute the "brake switch" wiring to the t-stat switch. done.
                          I swear you're a genius... everything is setup ready to go like you said! Just need a low temp sensor and I'm all set.

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