You could always put some freon in the system and then let the shop properly fill the system. The LCI models take 1.54 pounds of refrigerant. My system would cool just not extremely well and the dealer only evacuated .51 pounds of refrigerant. So it was 1/3 full and the system would work and could cool the cabin on a 80 degree day; 85 degrees it struggled with. So if your system takes 1.54 pounds, put a 16oz bottle in and then let the mechanic put the rest in.