[9secfirebird]

there is a high pressure line and a low pressure line, just hold the schrader open with a long screw driver and stand back cuz its under a good amount of pressure. its just like letting air out of a tire. if you have R12, its def not good for the environment. some of the molecules in there eat O2 molecules, and they just keep eating and eating them, and ya know how they say aroesol is the cause of the hole in the ozone? this stuff will hurt it more than 15 aroesol cans will. if its R134A (retrofitted) the fitings on your thirdgen will look funny, like someone put one ontop of an older one. R134a is Much more environment safe than R12, thats why they phased R12 out. use the same process to release the 134A, though highly illegal, and ya really shouldnt do it this way, but you can release it into the air. on your 97 it has R134a in it, the thirdgens dont. however for the 85 or 90 to never have been charged thats pretty outstanding. by the way, once you change the engine if you want any hope of diecent AC, ya gotta change the dryer and haev the whole system Flushed and do your self a favor for the thirdgens, have it retrofitted to R134a from a shop that does AC, i think it costs 80-100 bucks for the whole deal, but dont quote me, everyones different. but a gallon of R12 is like REALLY REALLY expensive. 134a and 12 have different fittings. also dont forget to make sore all the PAG oil is out of the compressor and the lines and all that crap before ya put it back together. oh yeah, if its retrofitted and your not sure if the fittings you have on there are the retro 134 fittings, there should be a sticker on there,