Charging System

Fig. 21 Charging A/C System:

1. Start and run engine until normal operating temperature is reached and allow to warm up (choke off, normal idle). Set A/C control lever to OFF.
2. With R-12 drum or cans inverted, open R-12 supply valve and allow 1 lb. of liquid R-12 to flow into system through low-side service fitting on accumulator, Fig. 21 .
3. On models w/display diagnosis, when 1 lb. of refrigerant has entered system, engage compressor by setting A/C lever to NORM and blower switch to HI to draw in remainder of charge.
4. On all models, cooling condenser with a large fan will speed up charging procedure by maintaining condenser temperature below charging cylinder temperature.
5. Close refrigerant supply valve and run engine for 30 seconds to clear lines and gauges.
6. With engine running, remove charging low side hose adapter from accumulator service fitting. Unscrew rapidly to avoid excessive refrigerant loss. Do not remove a gauge line from its adapter when line is connected to A/C system. To disconnect line, always remove line adapter from service fitting. Do not remove charging hose at gauge set while attached to accumulator, as system will be discharged due to depressed Schrader valve.
7. Replace protective cap on accumulator fitting and turn engine off.
8. Check system for leaks.
9. Start engine and check for proper system pressures.