if it does not turn on at all then it needs a recharge, just buy the recharge kit at auto zone with the gauge built in. Replace until pressure is in the safe zone. If you get the compressor switch constantly kicking in ( on off , on off) after recharge then you have to much freon in it and use a small metal screw driver to release a little pressure at a time until compressor switch or clutch stays constanltly on.
You may have to do this a few times as it may be erratic until every thing settles in from the high side to the low side, due to charging from the low side.
Last year moving to vegas I had problems with my sentra and instead of me screwing around with it I took it to pep boys and they flushed the system, recharged it and checked it for only $120 with a year guarantee. The car as been fine every since.
Just watch out how they put the z up on a lift
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