my friend came over with his truck today to use some of my tools i watched this goof drain all the air from his high pressure line of the a/c and now he only gets hot air, i recharged his low pressure line with r134a which his truck takes but it still coming out hot and i dont want to touch the high pressure cause i dont know to much about a/c to do what ever i want so any suggestions???

and i am having a powersteering problem i dont know how to find the leak but i know there is no wholes in the line cause i took both lines off and took them to my dads buddy garry and he pressure test them for me with his machine kinda cool i liked it, it can measure how much pressure lines can take and you can put fuilds in the line and test it to the pressure it runs at to see if it can hold or if the line has a problem idk probably not interesting to everyone, but anyways the lines were just fine, i teflon taped every damn theard and it still leaked, so i have no idea were it is leaking from oh and i chaulked around the tank the plastic peice that holds the fuild cause it is loose and always dripping but still it is leaking from somewhere i am completely confused, i dont want to replace it cause i am cheap like that but if it is a whole or something in the pump maybe i can wield or soder it???