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Q:

where is located the low ac pressure switch on 1996 Nissan Sentra

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the compressor is not working
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There's a lot of other things that could cause the compressor not to work. Is there a full charge of refrigerant in the system?
That tells me nothing. You need to jumper the a/c compressor relay and tell me the low & high side readings. You will need a a/c manifold gauge set to view the pressures. You should have 30 to 40 PSI on the low side and 250 to 275 on the high side. These readings will show if you have a proper charge in the system.