Thermal Vacuum Switch - NCRS Discussion Boards

Thermal Vacuum Switch

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  • Jeff Carollo

    Thermal Vacuum Switch

    On my 79 L-48 I have 3 TV switches. I was able to locate replacements for the EGR and EFE, but cannot find a source for the Spark TVS that goes to the distributor...anyone know where i can get one ?
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43193

    #2
    Re: Thermal Vacuum Switch

    Jeff-----

    The switches that you currently have should be GM #373510 (aka Delco #212-352) and GM #14009008 (aka Delco #212-61). The one that you need is GM #355961 (aka Delco #212-12). This is a replacement for the original switch which was GM #3031549. Consequently, it likely will not be confiugured just like the original, but it should be 100% functional. The GM #355961 is still available from GM for a GM list of about 17 bucks.

    I'm not surprised that you're having trouble locating it. I'll bet that there isn't a GM dealer in the country that could come up with this part number on the basis of the information that is available to them.
    In Appreciation of John Hinckley

    Comment

    • Jeff Carollo

      #3
      Re: Thermal Vacuum Switch

      So, these switches are rated at different temperatures, but they may look the same ? I think I can match by color, right ? The purple switch controls the EGR and is mounted on the intake manifold...and the Spark switch should be blue and mounted in the thermostat housing ? or is it EGR Blue, and Spark purple ?I'm totally confused.

      Comment

      • Paul L.
        Expired
        • November 1, 2002
        • 1414

        #4
        Re: Thermal Vacuum Switch

        My former 1979 L-82 did not have the third switch (see pic). But it had yellow as EFE and purple as EGR. So by process of elimination I am going to guess blue. BTW they are configured differently in a physical sense. The vacuum hose sockets tell that story: yellow and purple mating is different.

        Comment

        • Joe L.
          Beyond Control Poster
          • February 1, 1988
          • 43193

          #5
          Re: Thermal Vacuum Switch

          Paul and Jeff-----

          The 79 L-82 did not use the third thermal switch. For L-48 applications I believe that it was installed in the second fitting in the thermostat housing. I thought that L-82s used a thermostat housing with a plug in the second fitting. However, from the picture I note that yours has one with an unmachined fitting boss. What is the embossed part number on this housing?
          In Appreciation of John Hinckley

          Comment

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