if it's r134, you can get a can and a gauge from any auto parts store. crank it up, turn the air on high connect the gauge and follow the directions. pretty easy and straight forward. they make refrigerant with dye in it, if you think you have a leak, and want to look for it. the can and gauge set costs between 25-40 bucks, depending on brand. once you have the gauge, you can use it on any car with r134 and a new can. fyi, once you install a can on the gauge/filler, it has to stay on, or you must use it all. if you take it off, the remainder of the can will come shooting out, all over the place.