[Badbubba]

Buy the kit. There's a couple of different kinds. Get the one that has a hose with a female thread on one end, for screwing onto and piercing the can. On the other end will be a fitting to connect to the suction side of your a/c unit. The hose fitting will only fit on the low pressure side (suction side) and will not fit on the high pressure side, so you can't hook it up wrong, different sizes. You will need to locate the a/c hard line, it is usually bare aluminum. Unscrew the cap on the fitting, just like you tire valve cap. The low pressure line, the one you want, will be a bigger diameter. Push the fitting from the hose down onto the hard line fitting. You may need to slid back the fitting from the hose. Just like a quick connect on an air compressor hose. Wear a thin pair of leather gloves when you do it. There will be a simple gauge on the hose. Cheap but works OK. Pull the trigger, I really hate that phrase, and add the 134A to your system. Buy the 134A cans that have sealent and oil. If you have a leak, you most likely lost some oil from the system. Also, look around your a/c system for dirty/greasy areas. When you have a leak, the oil will exit through that leak as well. If you find an area as mentioned, you probably found the leak. If it is not excessive, thinking you have a very minor leak, it is cheaper to recharge your system every year or so, than to pay for a repair. Usually I add a can or two, the gauge usually will need to be on the higher side of green on the gauge scale, indicating the system is charged. When the aluminum hard line/accumulator begins to "sweat", you are close. When charging, hold the can upright, with the fitting on top. If you charge with the can upside down, you add 134A as a liquid to system, instead of a gas. If you add too much in the upside position, you could damage the compressor, unlikely, but a possibility. Just follow the manufacturer's directions, you'll be fine. Fairly simple.