The dual (or triple) pressure switch interupts the signal to turn on the AC. If you push in the button and the light on the switch stays off, thats probably why.
Look for the silver canister looking thing in your AC system. It should have a plug coming out of it. Make sure that plug has continuity. If it doesn't, thats where you would want to jumper it, to force the AC to turn on. However, you probably have low pressure in your AC system and running it risks damaging the compressor.
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