Recharging AC system 93 Eldorado
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Recharging AC system 93 Eldorado in Past Cadillac Vehicle Discussion; Hi all: Is there a procedure to follow for adding Freon to the AC system without first disconnecting the negative ...
  1. #1
    lgeorge is offline Cadillac Owners Member
    Automobile(s): 1993 eldorado
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    Recharging AC system 93 Eldorado

    Hi all: Is there a procedure to follow for adding Freon to the AC system without first disconnecting the negative terminal of the battery to reset the ac system? I got the message "VERY LOW REFRIGRERANT, AC COMPRESSOR OFF". The system will not let me add Freon to the system without first disconnecting the negative terminal.
    Thanks

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  3. #2
    stoveguyy is offline Cadillac Owners Connoisseur
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    You got message so system is low. How low? Do u have gauge set? Will u stop adding freon when air is "cold"?

  4. #3
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Won't let you add refrigerant before disconnecting the battery? The engine and AC compressor have to be running while you add refrigerant. You have to clear the code before the compressor will run.

  5. #4
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: Recharging AC system 93 Eldorado

    Quote Originally Posted by lgeorge View Post
    Hi all: Is there a procedure to follow for adding Freon to the AC system without first disconnecting the negative terminal of the battery to reset the ac system? I got the message "VERY LOW REFRIGRERANT, AC COMPRESSOR OFF". The system will not let me add Freon to the system without first disconnecting the negative terminal.
    Thanks
    -------------------------------
    YES - but FIRST -
    if the system IS low on freon -
    there IS a leak somewhere -
    and that leak SHOULD be fixed -

    STOP-LEAK products should NEVER be used -
    NO auto manufacturer or part manufacturer
    ever recommended the use of ANY type of Stop-Leak -
    --------------------

    connect the Manifold Set - also called the gauge set -
    read and record the pressures
    of BOTH the HIGH side and LOW side -

    if the static pressure is below 50PSI -
    the compressor probably won't run constantly -
    and an AC fault code would be set -

    clear the code -
    connect a can of freon to the access hose of the manifold set -
    invert the can so you are introducing liquid freon -
    and open the LOW side valve -

    you should hear and feel freon dispensing into the system -
    but only for a few seconds - until the can pressure -
    and system pressure equalize -

    then close the LOW side valve - and start the engine -

    the AC system should now have enough pressure
    to allow the compressor to cycle quickly -

    slowly open the LOW side valve to dispense more freon -
    until the proper amount of freon is in the system -
    and/or until the proper pressures - BOTH HIGH SIDE AND LOW SIDE -
    are reached -

    a perfect working system - on an 80* day -
    at a high engine idle - 1500RPM
    LOW side pressure of around 30PSI -
    HIGH side pressure around 195PSI
    and duct temperature - at the center vent - of 42* or less -

    hotter ambient temps will increase pressures -
    at 90* ambient -
    LOW - 35PSI
    HIGH - 250PSI
    duct temp 45*

    if you don't understand any/all of the above -
    or don't have the required tools/equipment -
    I strongly suggest getting the help from someone who has AC experience -

  6. #5
    lgeorge is offline Cadillac Owners Member
    Automobile(s): 1993 eldorado
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    Re: Recharging AC system 93 Eldorado

    Thanks for all the inputs. I tried the resetting of the code and was able to add Freon without disconnecting the negative battery cable. By the way this is the first time I had to add Freon since I bought this car, new, in 1993. So if this charge does not last very long then would not feel uneasy taking it to a AC repair shop.

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Recharging AC system 93 Eldorado

    One top off in 20 years is pretty good.

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