Quote Originally Posted by wickedintent79 View Post
Theres a high side and a low side high being red and blue being low im pretty sure you add into the low side and turn the ac system on we did it on a few gm cars in school but we used machines for it all. if using one of the auto zone kits im pretty sure it will onl;y hook up to on side not the other

yeah you hook it up to the low side when charging it and run the cars ac and turn it all the way cold.

at least thats the way you charge your home ac. i do heating and cooling but dont know much about car ac.