I've used the Kit to recharge my 2003 Blazer. It works well, and is easy to use. All you have to do is hook the hose up to the bottle and then hook the other end of the hose up to the low pressure line input and turn the valve on, that is on the Bottle. After you turn the valve on you start up the Blazer, turn the A/C on and rev the Engine a little until you feel the Bottle getting empty. When the bottle is empty or doesn't seem to be emptying anymore you turn the car off and remove the hose from the input on the car and screw the cap back on.