Second floor ac system was frozen at outdoor and indoor system in Newton. Shut down outdoor unit and ran blower for an hour to thaw coil. Once coil was thawed checked refrigerant pressures. Unit low. Charged system with 2 pounds of R22. Unit running 65/155. 8 degrees SH and 9 degrees SC. Also added some sealer tape along furnace to evaporator coil to help with air leakage.