Actually you can save yourself ALOT of money and buy a recharge kit from Advance Auto and as soon as you start to put the refrigerant in it will escape from the place where it is leakin from. I did the same thing on the truck that I have, and found that all I needed was an o-ring or two to fix the problem. The kit is only like $60 and you can stop recharging as soon as you spot the leak, and even if you use the whole kit before you find the leak, I am sure that it would be WAY more than $120 to find/fix the leak and replace the refrigerant. :Beer