Arrived onsite for ac maintenance on 1 system. Asked customer to turn AC on to confirm operation. System is from 1998 and showing age. Outdoor condenser coil fins are falling parts. Checked all electrical. Chemically Cleaned outside coils, measured pressures for R22 at 43/148psi with 2 degree sub cooling with outside temperature at 62 degrees. Measured temperature drop at 12 degrees. Cleaned evaporator coil and blew out condensate line. System running but low on phaseout refrigerant. Recommend upgrading. Found the unit without refrigerant caps outside. As a courtesy added refrigerant service caps
