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You will need R134a, and a filler hose. Charge the system on the low pressure side, it should have a blue cap on the charge point. Your filler hose will only fit the low pressure side, just in case the cap has been removed.
Yes. i would perform the same test on a 1997 altima. those had the same problem with the intake manifold gasket leaking. the gasket will brake and you will have a leak.nissan didn't change the gasket. the same gasket is beeing used on 1997 and the 2001. do the carb cleaner test and let me know how it responds to some carb cleaner.
If you have an AUTO a/c setup, than yes there is an amplifier mounted into the air box along with the blower motor resistor. This system has mode door inside the air box , but I don't think that's your problem, because your compressor is not coming on right?? Explain to me one more time, what is exactly is happening w/ the A/C. Be specific. Let me know what year this is also. I have seen the wire that goes into the compressor brake right at the compressor, that is if your Altima is pre 1998. Let me know.
I Had the same problem, and is the compressor. There is a coil that when receives 12 volts, it moves to engage the clutch, but as is passes about 10 minutes, that coil stop working, so do the compressor, and the system starts blowing hot air. You have to take out the compressor and get to somebody that can change the coil. It cost in parts about 50 bucks, plus recharge the system with new refrigerant. Don't try other test, just go to the compressor put a tester and mesures the voltage at the wires after the security pressure valve on it.