I arrived to perform a diagnostic on an air conditioner. Upon inspection, I found system was off. Customer stated they seemed to have very little air flow, found A-Coil still approximately 40% frozen. I turned the blower on to help thaw coil, waited for coil to thaw per customers are seniors. System is low on charge, explained repair/ replace options, customer opted to replace. I added 1# R22 to system for cooling until install.