300zx is the AC R12 or R134

[herewegosteelers]

Assuming it was never changed... Is a 1991 300zx compatible with the AC canisters that you can purchase in the parts store? I read its R12 and its been a while but isnt that the old stuff? If so is it costly to convert it?

[NolimitZ32]

stock is R12, you must have a license to by that s*** and its too expensive to be worth it, to convert you need the two fittings high and low, from there its like a regular ac service, pull vacuum, fill, enjoy.

[herewegosteelers]

thanks, can i get the fittings anywhere?

[Milton'Z Nissan'Z]

My compressor went bad a few years ago, so I bought a product called Freeze 12. No conversion necessary and it blows colder than it ever did with the R12. The kit came with everything including leak test die and more refrigerant that needed. It cost about $40.00 including shipping on eBay (I know, eBay ...YIKES) but it was from a seller that had a ton of positive feedback about the stuff so I thought it would be worth a try. It's non-flammable as well (not propane based). It's been a good couple of years now and no issues at all.

[NolimitZ32]

thanks, can i get the fittings anywhere?

http://shop.advanceautoparts.com/webapp ... T|GRP2004A____

this is what your looking for, if I were you id pull vacuum on the system before charging it though.

[evildky]

when converting to R134a you can get the adapters at any parts store, it's a good idea to replace the reciever/dryer at the same time, it's not terribly difficult just be sure you don't overcharge the system

[300na-sty]

yes like he said replace the reciever/dryer if you are doing a retro fit. also make sure you get the P.O.E. refrigerant oil, it can be used with both r12 and 134a.(just in case you don't get all the r12 out) otherwise you will contaminate it and could possibly ruin your whole system. although r12 runs alot colder than 134, finding it will be hard and expensive. if you are gong to do a retro fit you should take it to a good shop, unless you know what you are doing and have access to a/c machines.

[es.biggs]

Don't even try to retro-fit without properly evacuating the system of the R12. Mixing R12 and R134a will change the chemical make-up of the refrigerant and it will have an even lower boiling point than R12, which is lower than R134a. The R12/R134a mixture will work, and it will cool your air, but it is not how the system was designed to work. Boiling point plays a huge role in how the A/C system works, and lowering it will do more harm than good. You might want to consider taking it to a professional who is licensed to handle refrigerant...letting R12 into the atmosphere is terrible for the ozone and it is highly illegal. Without the A/C machine, I can't think of any other place to store old R12. But if you can figure it out you should sell it, as this stuff is worth as much as gold now!

The reason you would want to replace the receiver/dryer is because it has a "desiccant" inside it that absorbs moisture. A lot of times it is made out of silica, the same stuff you find in little packets in new shoes. Anyhow, the desiccant can get completely saturated in a little as ten minutes of being openly exposed to moisture in the air (anytime the A/C lines are removed and not plugged)

The desiccant then loses its absorption abilities and it will allow moisture into the compressor, which is bad news for any piston type of engine, which the A/C compressor is. Hydrolock is the word.

[txQ45]

ACKits.com has everything you need plus forum on howto and what to use..

[herewegosteelers]

my uncle is a plumber and has r12 for ac/coolers etc.. he drained it filled it and all is good