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A bad pressure switch will prevent the compressor from coming on. You need a good set of manifold ac gauges to check the pressures. Also you need to check voltage at the compressor, you could have a bad ac clutch. Check the ac relay as well, it is in the under hood fuse box, with the ac on remove and install it and it should click while putting in back in.
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pressure switch should be on the low side ac line near the compressor, it will have a connector on it with 2 wires.