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Running aux fan only...what temperature switch to use?

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    Running aux fan only...what temperature switch to use?

    I can't seem to find a 82C temperature switch as Jim suggested. Bavauto only has a 80C/88C.

    What is everyone else doing? Running a lower degree thermostat (71C, 75C, etc)? Or just use the 80C/88C temperature switch over the stock 91C/99C switch?

    As Jim mentioned, and it makes sense, you want the fan to come on high a few degrees above when the thermostat opens to cool the car, but to not let the fan run all the time when on the track.
    89 325is track project / 05 x5 / 99 M3
    E30 stuff for sale | Parts I'm looking for

    #2
    Never fails.... Will this work?

    89 325is track project / 05 x5 / 99 M3
    E30 stuff for sale | Parts I'm looking for

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      #3
      Using 80/88 with a 75C thermostat.
      '12 F30 328i Sport Line
      '91 SpecE30 #523
      '00 Ford F-350 Dually Tow Vehicle

      BMWCCA #360858 NASA #
      128290

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        #4
        Originally posted by kishg View Post
        Using 80/88 with a 75C thermostat.
        Is the fan coming on when driving? Or only after pitting?
        89 325is track project / 05 x5 / 99 M3
        E30 stuff for sale | Parts I'm looking for

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          #5
          Originally posted by bmwpower View Post
          Is the fan coming on when driving? Or only after pitting?
          only when idle in pit lane. don't really need it when driving on the track.
          '12 F30 328i Sport Line
          '91 SpecE30 #523
          '00 Ford F-350 Dually Tow Vehicle

          BMWCCA #360858 NASA #
          128290

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            #6
            The BMW switch will work.
            The car makes it possible, but the driver makes it happen.
            Jim Levie, Huntsville, AL

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              #7
              Originally posted by jlevie View Post
              The BMW switch will work.
              Huh? You said to go with 82C. Which one do you mean?
              89 325is track project / 05 x5 / 99 M3
              E30 stuff for sale | Parts I'm looking for

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                #8
                bump......
                89 325is track project / 05 x5 / 99 M3
                E30 stuff for sale | Parts I'm looking for

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                  #9
                  I used all stock s52 gear, and had a "constant on" electric fan (not needed, just got wired that way), zero problems on the track.
                  bmpr stkr: real racers go left and right... so tru

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                    #10
                    Originally posted by bmwpower View Post
                    Huh? You said to go with 82C. Which one do you mean?
                    i think he meant the BMP one will work.
                    '12 F30 328i Sport Line
                    '91 SpecE30 #523
                    '00 Ford F-350 Dually Tow Vehicle

                    BMWCCA #360858 NASA #
                    128290

                    Comment


                      #11
                      Originally posted by kishg View Post
                      i think he meant the BMP one will work.
                      Ok, that makes more sense. When he said BMW, I was like...wha?
                      89 325is track project / 05 x5 / 99 M3
                      E30 stuff for sale | Parts I'm looking for

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                        #12
                        Use the stock aux fan connector so you can manually turn it on with the AC button. In addition, you will still be able to rely on the stock temp switch to auto turn the fan on.

                        NASA MidSouth TT Director / GTS2 #018
                        Mods: Coastal PS Fluid, 10w40 Oil
                        Future Mods: Bosch Micro-Edge Wiper Blades, Painter's Tape, Spark Plugs, Freezer for Nutty Buddys, Adam Nitti CD's

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                          #13
                          Originally posted by Skafrog View Post
                          Use the stock aux fan connector so you can manually turn it on with the AC button. In addition, you will still be able to rely on the stock temp switch to auto turn the fan on.
                          The only worry I have about doing that is the side effects of having the A/C switch on....idle bump and whatever else goes along electronically with having the A/C on.

                          Unless I just somehow rewire the switch to only turn the fan on and remove the link to the ECU for the idle bump...I need to look at the diagram again...
                          89 325is track project / 05 x5 / 99 M3
                          E30 stuff for sale | Parts I'm looking for

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                            #14
                            Originally posted by bmwpower View Post
                            The only worry I have about doing that is the side effects of having the A/C switch on....idle bump and whatever else goes along electronically with having the A/C on.

                            Unless I just somehow rewire the switch to only turn the fan on and remove the link to the ECU for the idle bump...I need to look at the diagram again...

                            this is a track car right??? how come u still gonna have air con pump installed.... as far as i know the idle bump and power loss comes due to the air con pump being activated, in my opinion if it is your track car then remove the pump

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                              #15
                              Originally posted by Mohammed_A View Post
                              this is a track car right??? how come u still gonna have air con pump installed.... as far as i know the idle bump and power loss comes due to the air con pump being activated, in my opinion if it is your track car then remove the pump
                              I'm not 100% sure, but I thought the idle bump was from the ECU and not a result of the compressor turning on.

                              A/C system is out of the car...
                              89 325is track project / 05 x5 / 99 M3
                              E30 stuff for sale | Parts I'm looking for

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