Arrived in Smithville for AC Maintenance, Upon my arrival I found that the emergency drain pan was full of water. Performing a diagnostics I found that the insulation in the blower box had came loose restricting the air movement system causing the coil to freeze up. I secured the insulation back to the furnace using metal strapping and tested the system. I found the system is operating within the manufacture specifications at this time. I also cleared the water from the emergency drain pan while on site.