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Thread: freon amount

  1. #1
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    Default freon amount

    Does any remember the amount of freon to go into the air conditioning system without it being over charged and then going into an on-off cycle? I seem to remember 1.2# or 1.4# from an evacuated system but not sure.

    Thanks

  2. #2
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    Don't know the exact amount, but it's not freon (I doubt you can even by freon anymore)--you need to use R134a according to the install manual. I don't think you have to worry too much about the quantity of refrigerant you use, though, because you just fill the system until it doesn't take any more--it only takes what it needs.
    Joel

    '67 Lotus Elan S3 DHC (owned since 1970)
    '17 Ford Focus RS

  3. #3
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    Default correction:R134a amount

    Thanks Joel,

    Yes, you are correct in that the unit uses R134a. I misspoke when I said freon (R-12) and to your point they are not interchangeable. I just used the "common" term for ease. But it does matter on the Noble as over filling the A/C unit will cause it to cycle off when the engine is above idle. It is somewhat less than what is in the "green" area on a R134a pressure gauge. 1G told me the issue and amount a year ago and I forgot to write it down and my memory is fuzzy.

    FlyNoble

    69 Lotus elan
    88 M3
    02 M3 SMG
    04 Noble

  4. #4
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    Default

    According to Mike E. at 1g, the correct amount of A/C charge is 1.4 lbs or 22 oz. Please note that the Installation Manual in Chapter 7, on page 9 says 2.6 lbs or 41.97 oz. This is an error in the Manual according to Mike E.

  5. #5
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    Quote Originally Posted by caccobra View Post
    According to Mike E. at 1g, the correct amount of A/C charge is 1.4 lbs or 22 oz. Please note that the Installation Manual in Chapter 7, on page 9 says 2.6 lbs or 41.97 oz. This is an error in the Manual according to Mike E.

    FYI

  6. #6
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    there is no correct fixed figure, IMHO, there is only one way to charge the a/c correctly, and it generally ends up around 2.5 lbs. that is to use the super the heat theory during charging, with that said, I would target 12 degrees super heat at 2100 rpm's. also if the expansion valve refuses to ring, or oscillate, as I have found in multiple cases, it needs replacing. in other words, if the exp valve is hung, then the a/c will only be charge correctly at a particular rpm/ambient temp/cabin temp.
    Troy
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