What is the amount of ac fluid needed for this model to be full on 2002 Saturn L300

40 lbs -45 lbs what???

Asked by for the 2002 Saturn L300
sounds like you shouldn't be attempting this yourself. More like 16-24 ounces or .45-.85Kg. if car hasn't been wrecked in front there should be a sticker with the A/C system requirements of R-134 and oil If the measurement's only in Kg. then you should get a conversion chart (google online?) May be worth a shop and have them add dye.