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How much A/C freon

Discussion in 'Interior' started by woody367, Jun 16, 2020.

  1. woody367

    woody367 TYF Newbie

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    The ac in my 99 4dr Yukon with front and rear ac is not cold. System is very low.My info decal is missing so how much freon should a empty system take, 2.75lbs? I am going to replace the orifice tube the evacuate the system and add some dye. Do I need to add oil if just changing the orifice tube? Thank you
     
  2. liquify33

    liquify33 Full Access Member

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    Last edited: Jun 17, 2020
  3. PNW VietVet

    PNW VietVet Supporting Member

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    You should always replace the Receiver Drier/Accumulator if you open the system. What you do is up to you but you SHOULD. Make sure when you evacuate the system that when it is done and the vacuum is at the lowest it can go, shut it off and watch the needle. If it moves/climbs, you have a leak.
     
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  4. TheAutumnWind

    TheAutumnWind Full Access Member

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    If the system has a leak the drier needs replaced. Pour the oil out of the accumulater/drier and measure the volume and replace that amount. Replacing orifice tube does not require oil.

    My 94 rcsb takes about 2 cans. Fill until your pressures are correct though, dont guess. Get a set of gauges.
     
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  5. woody367

    woody367 TYF Newbie

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    So I found the decal and if I am reading right ir is 44oz for my Tukon with rear A/C. I will replace the dryer as it has never been changed before. Should I get 3 cans with the dye or just need 1 with dye and 2 without? Also is one brand of refrigerant better then another?

    20200617_181800.jpg
     
    Last edited: Jun 22, 2020
  6. woody367

    woody367 TYF Newbie

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    With the front and rear a/c is there a separate A/C Accumulator/Drier?
     
  7. liquify33

    liquify33 Full Access Member

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    No.
    There is a fan and evaporator over the passenger wheel though.
     
  8. woody367

    woody367 TYF Newbie

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    Ok Thank you. Is one brand of freon better the another? Should I use 3 cans with the dye or 1 can with dye and 2 without?
     
  9. 79jasper

    79jasper Member

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    Personally, I wouldn't buy refrigerant that has any mention of "seal conditioner" or stop leak.
    If starting from empty, I would just add the dye separately. Add it between vacuuming and charging.


    Sent from my SM-N960U using Tapatalk
     
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  10. TheAutumnWind

    TheAutumnWind Full Access Member

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