Recovered all Freon fm system. Removed old coil, drain, Freon lines. Blew nitrogen down drain line to make sure drain is clear. Inspected hat exchanger, no cracks seen. Blew nitrogen through Freon lines to clear. Installed new Evap coil while purging nitrogen through lines. Installed filter drier, horizontal drain pan, duct transition, and reconnected drain and Freon lines. Leak tested, Triple evacuation pulled down and held . Added all new Freon to system, system run checked all ok at this time.