Performed ac diagnostic found bad blower motor. We can take a chance and try replacing the blower motor and capacitor. But due to age of system and price don’t recommend it. Also if we have the motor out would recommend doing a blower clean at that time. And adding a maintenance plan to help maintain system Installed new motor and capacitor and tested system. 18 degree temp split at vent I could get to. Can’t guarantee system will last due to age and shape. Clients aware.