This How-To shows you the essentials of identifying your evaporator coil. Steve at HvacPartsShop.com explains the useful information on the service tag of your evaporator coil. The model and serial number of the evaporator are covered in the explanation. The correct model and serial number are of critical importance in your receiving the manufacturer recommended replacement of the evaporator coil or replacement components such as a TXV, drain pan or capillary assembly for your evaporator coil.