AC system part question

Discussion in '1978 - 1981 Specific' started by Macsouthcarolina, Mar 8, 2020.

  1. Macsouthcarolina

    Macsouthcarolina Member

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    I’m putting the AC back in my 80 and have a question about one of the hoses and wiring. I ordered the compete AC kit from Original Air. The salesman asked if my system had a high pressure switch, didn’t know but had some hoses the PO gave me when I bought it (picture attached). From this hose he said I need the one wit the high pressure switch. I’ve got the system installed now and do not know what to do with the ‘high pressure switch’. Here’s the old hose, the new one does not have the plug on it just 2 of the fittings opposite each other (pictured at bottom)
     

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    Last edited: Mar 8, 2020
  2. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    My 80 does not have a switch in the high pressure line of the A/C system.

    My Haynes manual doesn't show one either.
    upload_2020-3-8_9-24-30.jpeg
     
  3. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    The manual diagram looks like this:

    upload_2020-3-8_9-26-51.jpeg

    I only have the “pressure cycling switch” with 3 green wires. (One is green and white.)
    upload_2020-3-8_9-29-29.jpeg

    If there’s a Schraeder valve in that extra port, put a plastic cap on it and call it good.
    If the port is open to the air, I’m not sure what the best way of closing it would be.

    Hope this helps!
     
  4. Macsouthcarolina

    Macsouthcarolina Member

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    Thanks. The extra port is open to the air unfortunately.

    guess I’ll call original work tomorrow and see what’s up
     
  5. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    If you still have the high-pressure switch from your old hose...
    I don't see why you couldn't thread it on to the open port just to seal it.

    It won't be functional but your 80 shouldn't need it.

    Oh... You should put some tape or something over that open port to keep air/moisture out of the new accumulator.
     
  6. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Quick question for you.
    Since you've obviously been working on this system... Where is the Orifice tube located?
    [​IMG]
    Is it in the aluminum tube indicated by the yellow arrow?

    upload_2020-3-8_12-53-36.png

    Did you replace the evaporator?
    If so... Were you able to do that by only removing the engine side of the case?

    Good Luck with your refilling, etc. Hope it works well for you!
     
  7. Macsouthcarolina

    Macsouthcarolina Member

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    Yes orifice tune is in the place you indicated.

    replaced the evaporator and was able to get to it by removing engine side of case only. Mine was broken so had to replace. Was in the process of putting on aluminum heads and headers so the snowballed into AC while I was at it.
     
  8. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Thanks for the info! :D

    You did the right thing to replace the evaporator while you had the heads off.
    Access to the screws/bolts on that evaporator case is greatly improved with the head out of the way!

    I've been shopping around for parts to replace my leaking compressor and I fear I may have a leak in the evaporator too.
    (The lower line to the evaporator is covered with oil. :( )

    Post back when you get it all hooked up and charged. I would like to know how the Original Air system works out for you.
     
  9. Macsouthcarolina

    Macsouthcarolina Member

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    I didn’t want to replace it but was unsure of what I had. The one in there looked fine but had been open for years. I didn’t want to have to pull that case after everything was back together so I bit the bullet.

    I also replaced the condenser because the one I had looked rough. The entire kit was like $1100 for everything
     
  10. bigdan

    bigdan 1980 Z28

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    Hi Mac, I'm thinking about doing the original air upgrade for my '80. Just curious to get your thoughts on the original air parts. Would you recommend them? Any issues with fitment? Any other recommendations or things to look out for?
     

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