1992 volkswagon golf 1.8?

a/c filled and compressor works a/c lines get hot i mean hot..i dont kno what to change next??i need help fluid is moving you can see threw a/c line the lil glass on line?pls help blows hot air a/c does kick on but is filled and blows hot air is it the condensor or the evaporator i need to change ?
1992 volkswagon golf 1.8?
sounds like a clog or crimp in a line. have an a/c tech purge the system and check for proper cycling.