Did you open the system for any length of time, or did you drop the compressor and remove the engine with the system intact? If it was open at any time and was exposed to anything like actually driving the car or just being open for a few weeks then I would flush the entire system out to get any debris out and as stated above the Accumulator and the Orifice tube, and the dye is a great idea any time I put freon in for someone I always use the some dye. You don't even have to use any of that expensive black light stuff, just use a CFL black light bulb from Walmart in a drop light and it will light up like you slaughtered a Predator in there if it does leak.
Jeff
