Just ordered a UV dye injection system to find the leak in my A/C system.When leak is found, i will evacuate,fix leak,vacuum and recharge.My questions are.1.How much freon does this system hold? 2.How long should i run system after injecting dye? 3.How long should system be under a vacuum?And finally what should the preasures be [approx.] This sounds all so easy, but not knowing where the leak is, when i find it i will be back on this forum. Thanks