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Suddenly lost charge

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    Suddenly lost charge

    1990 Suburban with rear A/C

    What would cause an A/C system to suddenly lose almost all of its charge and then hold its charge after being recharged?

    The A/C on my Suburban suddenly quit working. I put the gauges on it and it had almost no charge. I recharged it and the charge seems to be holding just fine even after several days. I even used an electronic refrigerant gas detector and could not find anything. I'm pretty sure it has to be a very large leak for the system to suddenly go flat like that. What could be the cause of this?

    About the only thing that will blow off the charge and re seal is the over-pressure safety valve found on some systems. There should be a tell-tail mess of oil if this is the case.
    Otherwise, it is far more likely you have a slow leak. You gave no pressure or temp readings, so not much we can do for you.