Initial system test, Check system components such as hoses, belts, condenser,compressor, fans, electrics etc, Check internal system controls, flaps, heating etc, Recover any existing refrigerant from the system, Vacuum A/C system, Regas (recharge) A/C system with refrigerant to vehicle specific levels, Add A/C oil and leak detection dye, Leak test components, Full post re-gas system test