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This is not to contradit any senior members on PW, but here's something i know that i am willing to share, and my information is based on efi corolla a/c not any other car.
Near a/c coilbox there is a electronic circuitboard which is the brain of corolla a.c unit, its located behind the glove compartment and it has a thermometer like rod stick with black plastic tip to sense the temperature.
its NOT located outside the passenger compartment and its to sense temp inside car. The climate control slider knob or rotating knob with temp written in some corollas and dotted line in other also selects when to activate the temp sensor.
The fan blower in corollas is also connected the temp sensor.
when coolest settings selected, fresh air knob closed, and fan set to max speed and econo button off, a/c on,, the a/c will take the car interior to coolest settings even the winter.
Now when temp circuitboard or the brain malfunction it can also NOT trip off a/c hence coilbox will freeze and a/c blower WILL stop throwing out cool air.. that is why i suggested to have the coilbox service because i believed yr car's coilbox could be choked by dust.
well i can be wrong. so mech will tell what is the problem after chk up
i often drive with a/c, window bit rolled down for smoke exit purpose and i sense a/c dont switch off that frequently when set to max power because fresh air from window keeps interior warmer.
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