How much a/c recharger am I supposed to put in my car???

hi I have a 1986 nissan maxima and I'm going to get the ac charged again..im pretty sure it's transformed from r twelve to r134 and I'm thinking about to get two 16 oz cans of it.is that too much??

If it was transformed to r134a there should be a sticker on it stating that fact. One can should do it. The thing is, you do have a leak and all you're doing is throwing away money. The best thing to do, is to have the leak repaired, then have it recharged. That way you will not have to keep doing it all the time. Plus, you could mess up the compressor if you do not know what you're doing.

Take it in and get if fixed right.
that's the best way to do it.

take it to a mechanic, if it is loosing freon there's
a leak. your wasting your money it is just going to leak out again.

no mancanic here, but watched my dad four sum time and have delt lots with my own veicheles. most of the time I have to tell my hubby wats wrong with one of our veicheles.
i could
1 sum cars differ from other cars, so it could rely on each individual car as to how much freon it could take. it also depends on how low your freon is. you may be able to generally get extra to be on the safe side, then take the unused back to the store.
2 one way to tell if it was transformed is to see in attachments on the compresser/hose. most of them are little round copper pieces.
3 not sure how frequently you must add freon, but if it is a good bite, then you have a leak someplace may be a dry hose or a seal leak or compresser . if you have a leak, you may be able to buy freon that has a leak sealer in it. in this case, I could only add one can of that, then use the regular r134 for the rest that is obliged. if you put to much freon with the sealer in it, then you may be able to have trouble with it sealing up too much/stopping up.
4 the best/safest way to add freon is to buy a pressure gage, this way you'll know how much pressure is required while adding the freon. you may be able to typically buy the freon, gage and attachments all in one kit. where I live the kits cost around 35.00. if too much freon is added, it can lock the compresser up. once a compresser is locked up, it can hardly ever be freed causing the have to buy another one.
5 if you know nothing about adding the freon, I suggust to get someone who does know to do it for you. we have never had this to happen, but I have heard that you may cross the lines up or something and it can backfire causing it to explode. like I said, I have only heard this happen.

Get a manual.