If you raise the hood and look at the silver canister type thing on the left side of the firewall,you will see two black tops.the one closest to the firewall is the low-pressure line.that is where you put the freon in.I do recommend having a gauge that will read p.s.I. Because you don't want it to be past 40 p.s.I. That will mean a new compressor.ive had the same problem.be mindful of your tensioner pulley.check it to make sure its still in good shape and the belt.