Hi Experts.
thanks everyone for great support.

i added freon 18 oz 134a + as recomended by nissan sticker under the hood.
it blow cold air but not really cold. i had to keep the ac at max to get some cold air.

do i need to add any other oil beside freon ?
any hose causing not to give cold air.
also
when the ac is set to air come from the front, its good but when i set it to on the feet and front, it gives very less air and even front and feet on the max ac level.

how many filters are there in 04 maxima.

 

Sometimes you just have evacuate the old stuff out the A/C lines. I just drove my car from NYC to GA and before I left i notice the A/C wasn't blowing super cold. figured the freon was just broken down due to age being that the A/C wasn't warm indicating a leak or a bad compressor. So I took it into a local mech who charged a A/C service and now it's pretty much ice coming out of my vents.