Pontiac Repair: 2000 Pontiac Sunfire, freon gas, pontiac sunfire

Question
The a/c was not coming on cold.  Took the car to firestone and they ran a leak test came back fine. Said they added a lb of freon, thogh two days later not cold so i added 18 oz plus another 6or 8 oz. obviously they never put any in because the car should only hold 1.5 lbs.  any way they said that the compressor doesnt come on unless freon is in there that tey did add freon and yes tere is no leak yet for some reason no cold air comes out can you help me solve this dilemna or do I need to detail the question a bit better?  Sincerely sweating out here in cali

Answer
OK THE FEEON IN THE SYATEM MUST BE THAT  FREON, NO AIR
THE A/C SYSTEM WORKS WITH A CHARGE OF FREON GAS, IF THEY OR YOU HAD TO ADD FREON THEN THERE IS A LEAK,IF TO MUCH FREON IS IN SYSTEM IT WONT COOL BUT COMPRESSOR WILL RUN, I SUGGEST YOU HAVE IT VACUMED OUT AND A SUCTION OF ATLEAST NEG 25 LBS OF VACUME APPLIED TO THE SYATEM FOR 15 MINUTES AND NEW FEON INSTALLED ALONG WITH DYE. IT SHOULD COOL JUST FINE, IF IT STARTS TO NOT COOL HAVE THE LEVEL RECHECKED AND IS ITS LOW LOOK FOR THE EXPOSED DYE.IF YOUR COMPRESSOR IS ON AND STAYING ENGUAGED YOU PROB HAVE TO MUCH INIT AND IT WONT COOL RIGHT , ALSO IF THERE IS ANY OUTSIDE AIR IT THE SYSTEM IT WONT COOL