Why is my AC not cold after a recharge?

A recharge that didn't fix it means one of three things. One: the system was never low — the compressor isn't engaging because of a blown fuse, a bad pressure switch, or a failed clutch coil, and adding refrigerant did nothing. Two: it was low, you overfilled it, and high head pressure is now making it blow warm — overcharging is the single most common DIY can-kit mistake. Three: the leak is big enough that the charge is already gone. A shop can put gauges on both sides in ten minutes and tell you which; guessing with another can usually makes it worse.

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