A\C only works when i put it on 4.

You have to repair or replace the blower motor resistor. It's right there in the maintenance & mechanical sticky:
http://forums.maxima.org/1031723-post19.html
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jerrod99_se-l
4th Generation Classifieds (1995-1999)
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5th Generation Maxima (2000-2003)
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to the blower motor resistor
