Just a word of caution here - too much stop leak and even too much of the coolant with the test dye dye in it can completely clog up your A/C system. At least that's what happened on the Grand Cherokee I had a few years ago. I was having problems with its A/C and tried to locate where the leak was by using the test dye. The A/C stopped working altogether & when I had a pro look at it before I sold the truck he said that one of the lines was completely clogged up from the dye.

Just an FYI!