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A/C manifold gauge clarification

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Orbang, Jan 17, 2021.

  1. Jan 17, 2021 at 11:06 AM
    #1
    Orbang

    Orbang [OP] Member

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    So my 2006 taco uses R134a refrigerant but seems like the only refrigerant you can get here in Canada auto parts stores is R12a. That's fine if I take the r134a out and replace with r12a.

    But my question is related to gauge sets. All the ones I've seen have r12/r134a scales.

    So what's everyone using and if using the r12/r134 gauges do you have to do some kind of calculations?

    Also, what are you using for a low cost set. If I buy a set I probably am not going to get a lot of use out of them so didn't want to spend a fortune on them.

    Thanks
     
  2. Jan 17, 2021 at 11:20 AM
    #2
    spitdog

    spitdog Well-Known Member

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    You need a set for R134a. When I bought a set I bought a good set, yellow jacket. I didn’t want to take a chance with a cheap set leaking and eventually need to buy a different set anyway. You can always resale them if need be. I snagged a new set of yellow jackets on eBay for $65. I anticipated my repair and tooled up during the winter. I’m going to hang on to them, cause you never know.

    No calculations needed

    Edit: Sorry re read your post, if you can’t get r134a. Get the 12 and just make sure your gauges are rated for the same. You would need to have the system evacuated completely if it has the r134a now.
     
    Last edited: Jan 17, 2021
  3. Jan 17, 2021 at 12:15 PM
    #3
    Orbang

    Orbang [OP] Member

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    Seems like I'd have to buy r12a not r12. From what I read r12a runs at lower head pressures so I don't follow how you can just use the r134a gauges straight up without some kind of calculations to figure out what pressures you should be getting.
     
  4. Jan 17, 2021 at 12:20 PM
    #4
    spitdog

    spitdog Well-Known Member

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    If the manifold gauge says it’s rated for both it will have 2 sets of numbers on the dial that will correspond to either the r134 or 12
     
  5. Jan 17, 2021 at 12:25 PM
    #5
    spitdog

    spitdog Well-Known Member

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    Like this


    https://www.amazon.com/PBAUTOS-Diagnostic-Evacuation-Refrigerants-Instruction/dp/B08FHPB3DP
     
  6. Jan 17, 2021 at 12:36 PM
    #6
    Orbang

    Orbang [OP] Member

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    Thanks for the info guys but I think you missed where it's r12a not r12. I have not seen a r12a gauge set nor much info on pressures this newer stuff runs at compared to r134a.
     
  7. Jan 18, 2021 at 3:28 PM
    #7
    wmgeorge

    wmgeorge Well-Known Member

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    A simple google search, R12A is propane, not sure about the pressures. I would look for some R12 or R134A this stuff is not approved in the US... Yet.

    FYI When I was teaching HVAC/R I had a student use this stuff in his car, seemed to work ok. I think the pressures are close to R12, check it out Here.
    https://en.wikipedia.org/wiki/HC-12a
     
    Last edited: Jan 18, 2021

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