DIY A/C recharge questions
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  • 1 Post By rodnok01
Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, DIY A/C recharge questions in Past Cadillac Vehicle Discussion; Hi all, Got a message on dash...A/C coolant low - compressor off. Decided to use the product "A/C Pro" advertised ...
  1. #1
    REALTOR Bob is offline Cadillac Owners Member
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    DIY A/C recharge questions

    Hi all,

    Got a message on dash...A/C coolant low - compressor off. Decided to use the product "A/C Pro" advertised on tv to give it a shot.
    First I reset the code so the compressor would run, I noticed it didn't run continuously, it would cycle on and off about every 5 seconds. so I waited for it to cycle on and then I would pull the trigger until it went off and stopped, over and over while watching the gauge as I went. eventually I ran out of freon, the hoses and the air started getting cold but I still had not made it to the ideal pressure on the gauge. Now for my question...current status is as follows, compressor still cycles on and off (on for 10 seconds - off for 5 seconds) air from vents is kinda' cold. When compressor is engaged pressure drops to 25 psi, when it's not the pressure rises to 55 psi. QUESTION: Is this normal and I just need to add more freon, or do I have another problem to consider.

    Thanks for your help

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  3. #2
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: DIY A/C recharge questions

    Quote Originally Posted by REALTOR Bob View Post
    Hi all,

    Got a message on dash...A/C coolant low - compressor off. Decided to use the product "A/C Pro" advertised on tv to give it a shot.
    First I reset the code so the compressor would run, I noticed it didn't run continuously, it would cycle on and off about every 5 seconds. so I waited for it to cycle on and then I would pull the trigger until it went off and stopped, over and over while watching the gauge as I went. eventually I ran out of freon, the hoses and the air started getting cold but I still had not made it to the ideal pressure on the gauge. Now for my question...current status is as follows, compressor still cycles on and off (on for 10 seconds - off for 5 seconds) air from vents is kinda' cold. When compressor is engaged pressure drops to 25 psi, when it's not the pressure rises to 55 psi. QUESTION: Is this normal and I just need to add more freon, or do I have another problem to consider.

    Thanks for your help
    ------------------------------------
    so - first question -
    did you find and fix the leak?

    the AC system is sealed -
    and should never require additional freon - or servicing -

    if the system is low - there IS a leak somewhere -
    -----------------------

    the AC compressor should NOT cycle in normal operation -
    it is either fully ON - or fully OFF -

    to PROPERLY diagnose an AC system - we need to know several things -

    engine at a high idle - 1500 RPM -
    with the AC set to 60* -
    center vents selected -
    medium fan speed selected -
    ambient - outside air - temperature -
    low pressure reading -
    high pressure reading -
    air temp at the center vent -

    from the information you have given -
    the low side pressure is too low -

    without more information - all we can do is GUESS -
    and I would GUESS you are still low on freon -


    the problem with the mickeymouse stuff you have -
    you have no clue how much freon is in the system -
    and no way to check the high side pressure -

  4. #3
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: DIY A/C recharge questions


    You really need a good "set" of A/C gauges. Also check the refrigerant inlet and outlet pipes at the firewall. They should both be cold and at the same temperature. You can check 'em by hand, but an IR thermometer is the best way. If the outlet is warmer than the inlet, you're low on refrigerant.

  5. #4
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Connoisseur
    Automobile(s): 98 DeVille, 97 DeVille d'Elegance
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    Re: DIY A/C recharge questions

    Make sure you have ac set to 60 max fan(set manually) and recirculate on when recharging/checking.
    Those cans of ac are just about worthless, spend 50 bucks for a set of gauges and you'll be able to do it the right way and save yourself money down the road.
    maeng9981 likes this.

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