6. IF NECESSARY, CHARGE SYSTEM WITH ANOTHER CONTAINER (a) If the first refrigerant container is empty, close the pressure valves. (b) Remove the container tap valve from the container. (c) Attach the container tap valve to a new refrigerant container. (d) Purge the air from the center hose by barely opening the low pressure valve and loosening the valve disc. (e) Make a hole in the sealed tap of the new container and charge the system. CAUTION: Be careful not to overcharge the refrigerant as it may cause failure of the bearings and belt. 7. WHEN SYSTEM IS FULLY CHARGED, DISCONNECT MANIFOLD GAUGE SET (a) Close both low and high pressure valves. (b) Close valve at refrigerant container. If using one pound containers of R-12, allow remaining refrigerant to escape by slowly removing the charge line. (c) Turn off the engine. (d) Using a shop rag, quickly remove both hoses from the compressor service valves. WARNING: Care must be taken to protect eyes and skin when removing the high pressure hose. (e) Put the cap nuts on the service valve fittings.