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Do I need to move a switch to the new compressor?

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  • Do I need to move a switch to the new compressor?

    I am replacing the compressor, orifice and dryer on a 2001 Chevy 3500 box truck. The old compressor had an electrical connection on the back that the new one does not. At first I thought I had the wrong compressor. But looking at the photos of several brands, none have the plug, but all have an opening with a snap ring. See photo. So I am assuming I need to move this sensor to the new unit. Is that correct, or am I supposed to buy a new sensor? If I need to move this from the old one; is there some trick to getting it out of the old compressor? I have removed the snap ring on the old one, but being 17 y.o.plastic I was reluctant to apply very much force? Advice welcome.
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  • #2
    Yes - you remove old plug with connection and put it in new compressor. The new one that's just a sealing plug doesn't come with the exact switch there for the vehicle the compressor may end up in. If that switch doesn't work or leaks get another correct one not included on new compressors.

    ? There's another snap ring or retaining clip still in the red switch or that wont come out when it's removed should almost fall out,
    Tom
    MetroWest, Boston

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    • #3
      Yes, I also swapped over such switch on my Suburban/Yukon compressor.

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      • #4
        Gently pull up while rocking and twisting most often will release the switch. Often the O ring sticks in the bore and the procedure will often work it free, if not a new switch isn't such a bad idea either.
        Last edited by Cornbinder89; 09-24-2017, 02:42 PM. Reason: Fat fingers typing, hit K instead of H in "such"

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        • #5
          Here's a new one what you would get if picture shows it may expire? On-line shopping that looks like the one for this under $15 if all fails. It's a high pressure switch if not connected default is compressor will not engage. Idea - if hot or too much pressure shuts system down in addition to another in high side line,
          Tom
          MetroWest, Boston

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          • patsusedparts
            patsusedparts commented
            Editing a comment
            Thanks all. The plastic crumbled as soon as I put pressure on it. New switch ordered from Rockauto. I can finish the job in a couple days. Enjoy your weekend

        • #6
          Thanks all. The plastic crumbled as soon as I put pressure on it. New switch ordered from Rockauto. I can finish the job in a couple days. Enjoy your weekend

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          • #7
            Try to make sure plug matches the thing. IDK - once 134a was used lots of stuff to prevent a blow-out of refrigerant was designed into system electrical monitoring to shut down rather than just a plain pressure sensitive thing there many would reset or not seal again but saved you from a busted belt maybe or blow out more.

            Plastic can stink. Brittle after being hot and cold many times. The bails on many assorted things bust off forever just properly wire tying them to stay connected if possible. Broken is broken and it needs the thing so no loss having a new one. Good luck that it all works out for you beware as you may know it's way too easy to mess up and do everything over again and more if you don't really know it ready to charge and other parts not harmed specifically condensers/"O" tubes clogged depending on type of failure you had,

            Tom
            MetroWest, Boston

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            • #8
              Thanks Tom. Yes, I isolated everything yesterday and flushed it thoroughly. I have a good vacuum pump. So I can make sure it is all in good order before I charge.

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              • #9
                Sounds like you have a grip on the whole thing just do remember to spin new compressor with fresh oil prior to start up. Better if you can charge to spec before totally the equipment to do that not cheap or available to many.

                If in question on anything find out now prevent the waste now. Again good luck. FYI - trying to archive some stuff here but is if you look up top - this forum is just new but from now a very old one that just got spammed so badly was ruined by that alone! Stay cool as needed :-)
                Hot here for a couple more days sign off say where I am can turn to full blown cold out any time now for me or my exact situation makes A/C very difficult when very cold to mess with, charge and know it's working properly when it's so freaking cold it's hard to know or test out,

                Tom
                MetroWest, Boston

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