When an AC system is running, the expanding freon is trying to absorb
some rate of heat. Measured in BTU per hour. If the air flow is low,
it will chill the air too cold (and might freeze). If the air flow is
too high, it won't make the air cold enough.
Low air flow is more likely to freeze the cold coil. Oddly enough, low
freon also creates a lower temperature, and is likely to freeze the
A combination of the two can also freeze a coil. Which further reduces
the air flow, and then you rapidly end up with NO air flow.
The original poster some days ago mentioned having reduced air flow,
turning off the system, and then the air flow resumed. Which is a good
sign of frozen evaporator.
Hope that helps.
Christopher A. Young
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