where do i locate the lower ac hose on my car for recharge and what type of refr on 1992 Nissan Maxima

just trying to recharge my ac because its blowing out warm/hot air

Asked by for the 1992 Nissan Maxima
2 answers
i rec you have it charged by a pro as to not damage other parts of the system. it could be either freon depending on if its been converted or not.
How do you know it's low on refrigerant? Can be several causes. Does the compressor come on at all? If not , problem may be electrical. Without guages you may over-charge the system also causing it not to cool