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Header Tank Coolant Level Indicator (Merc C230 mod)

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    Header Tank Coolant Level Indicator (Merc C230 mod)

    Hi,
    I have the Mercedes C230 header tank fitted to my Stag, as detailed on the Grampian Stags website.
    I was planning to fit a level warning indicator lamp, but on checking the level sensor in the Merc header tank, it looks like it is a variable level sensor (resistor), rather than a low-level warning switch.
    It seems to vary by about 100Ohms from low to high coolant level.
    I could fit a gauge or create a diode triggering circuit, but I was wondering if someone has already wired a coolant level warning lamp using this header tank.
    I did notice that Febi do a level warning switch that looks similar to the level warning sensor, but I am not sure it would fit (or work) in the C230 header tank.
    Thanks,
    Den

    #2
    I’m doing the same and I bought that header tank because I thought it had an ordinary level gauge, I think you can buy a universal level gauge and drill into the side but it would be better if you could use the existing hole in some way, hope someone has an idea or buy a different tank
    Thanks Alan

    Comment


      #3
      I use a Merc W124 tank. Has a reed switch for level.
      Level switch can be turned through 180 deg so can be Norm Closed or Norm Open.

      Neil.

      Comment


        #4
        I use a Volvo 850 tank, with an slot on slot off angle bracket, comes with a low level switch

        P1050113.JPGP1050447.JPG
        "The UK,s 2nd Most Easterly Stag" Quad Exhaust- ZF 4 Speed BOX

        Comment


          #5
          So much better when you can see the water level and a neat job 👍
          Yellow Rules OK

          Comment


            #6
            Now thats a sexy engine bay

            Comment


              #7
              Originally posted by Andrew S View Post
              So much better when you can see the water level and a neat job
              I totally agree
              1973 GT6 Mk3 Pimento Red
              1974 Stag MOD,3.45 diff,French Blue, Fiat seats, Belt EWP, H/Tank

              Comment


                #8
                Our Stag also has the Mercedes C230 header tank fitted and so I am interested to see if anyone answers the original question posted by DZP

                Regards

                Bruce
                1973 GT6 Mk3 Pimento Red
                1974 Stag MOD,3.45 diff,French Blue, Fiat seats, Belt EWP, H/Tank

                Comment


                  #9
                  Now thats a sexy engine bay

                  Yellow - it improves everything.
                  Header tanks - you can't beat a bit of bling.

                  Comment


                    #10
                    I'm looking at this modification, as the good Lord permitting (and vaccine) I plan to do the Alpine passes this summer in the Stag. It's so much easier if you can see the level of fluid at a glance rather than have to open the pressure cap every time. My specialist here in Poole is nervous of all these conversions on the basis that the more joins that are in the pipe the higher the risk of a leak from said joints. His preference is thus for the "Wards' header tank conversion, as the pipe work is solid.https://www.ejward.co.uk/new-parts/e...one-hoses.html

                    The ideal would seem to be the silicone piping with the Volvo 850 header tank. Does anyone know where to source the silicone piping that would be one peice?

                    Comment


                      #11
                      Given up on C230 tank and bought a W124 as suggested, now got to make more brackets!!!

                      Comment


                        #12
                        My W124 in the Engine Bay.

                        Engine Bay.jpg

                        Neil.

                        Comment


                          #13
                          Hi Neil

                          I have not seen one mounted in that position before and it looks very smart. However, doesn't it obstruct access to the Dizzy?

                          Regards

                          Bruce.

                          1973 GT6 Mk3 Pimento Red
                          1974 Stag MOD,3.45 diff,French Blue, Fiat seats, Belt EWP, H/Tank

                          Comment


                            #14
                            Hi Neil I assume the brackets are mounted on the bulkhead not the engine?
                            Alan

                            Comment


                              #15
                              Originally posted by RobinLegin View Post
                              I'm looking at this modification, as the good Lord permitting (and vaccine) I plan to do the Alpine passes this summer in the Stag. It's so much easier if you can see the level of fluid at a glance rather than have to open the pressure cap every time. My specialist here in Poole is nervous of all these conversions on the basis that the more joins that are in the pipe the higher the risk of a leak from said joints. His preference is thus for the "Wards' header tank conversion, as the pipe work is solid.https://www.ejward.co.uk/new-parts/e...one-hoses.html

                              The ideal would seem to be the silicone piping with the Volvo 850 header tank. Does anyone know where to source the silicone piping that would be one peice?
                              I think I purchased a silcone hose from the classic car show at the NEC, will have a look if i have the bill, cant see the problem with the extra connections if done well, there a loads of hoses to get a leak on , with a stag. A whole lot cheaper to used a second hand tank that had thousands spent on it's devevlopment of function and durabilty with a baffle system and correctly mounted level switch all for the price of pub lunch!
                              "The UK,s 2nd Most Easterly Stag" Quad Exhaust- ZF 4 Speed BOX

                              Comment

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