>Thanks, I think you have made some very good points but I have one point on
>which I am not entirely certain. Shouldn't measuring the pressures provide
>a good indication of how much charge you have? If both the hi and low
>pressures are low, don't you think its ok to add more freon? I agree that
>adding more just because the air isn't sufficiently cool is a bad idea.
The pressure guages are a good indication of charge, but a "weak" or clogged
compressor will cause both low high-pressure, and slightly elevated
low-pressure. Pressure is also temperature dependent, so be careful. The
only "real" way to know is flushez-vous.