If it's not coming on due to low pressure the A/C should have been not working so great for some time (as in a slow leak), or if you have a big leak look for an oil stain someplace along the A/C system. Probably the most common places for it to leak is at the little A/C "radiator" in front of the radiator, around the compressor, or at HP and LP ports (valves) where you connect your gauges to.
You need A/C in late November???
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