本SAE推荐规程的目的是为CFC-12（R-12）系统改装为HFC-134a（R-134a）提供维修程序，同时保持空调（a/C）系统的性能和完整性。本程序中概述的步骤在结合良好的维修实践和车辆制造商的改装建议（如有）后即告完成。CFC-12（R-12）和HFC-134a（R-134a）的单独维修设备，包括制冷剂回收/再循环（R/R）、维修歧管、真空泵、，应使用充电设备来保持制冷剂和移动空调系统的纯度。 该程序将最大限度地减少制冷剂释放到大气中，并将保持回收的CFC-12（R-12）和HFC-134a（R-134a）供应的完整性。本文件适用于用于冷却汽车、轻型卡车和其他具有类似CFC-12系统的车辆乘客室的空调系统。由于近年来的技术进步，该程序被推荐用于20世纪80年代中期及以后生产的普通车辆平台。在此时间段之前生产的车辆可能需要额外的改装要求。本文件不包括用于冷藏货物的移动车辆的空调系统，该系统具有密封系统。 本文件仅在与SAE J1657“改装制冷剂以替换移动空调系统中的CFC-12（R-12）的选择标准”的要求结合时才完整

The purpose of this SAE Recommended Practice is to provide a service procedure for retrofitting a CFC-12 (R-12) system to HFC-134a (R-134a) while preserving performance and integrity of the air-conditioning (A/C) system. The steps outlined in this procedure are complete when combined with good service practices and the vehicle manufacturer's recommendations (if available) for retrofitting their models.Separate service equipment, for CFC-12 (R-12) and HFC-134a (R-134a), including refrigerant recovery/ recycle (R/R), service manifolds, vacuum pumps, and charging equipment shall be used to preserve the purity of the refrigerants and the mobile A/C systems. This procedure will minimize release of refrigerant to the atmosphere, and will preserve the integrity of the recycled CFC-12 (R-12) and HFC-134a (R-134a) supplies.This document applies to air conditioning systems used to cool the passenger compartment of the automobiles, light trucks, and other vehicles with similar CFC-12 (R-12) systems. Due to technical advancements in recent years, this procedure is recommended for common vehicle platforms produced in the mid- 1980s and later. Vehicles produced before this time period may require additional retrofit requirements. A/C systems used on mobile vehicles for refrigerated cargo that have hermetically sealed systems are not covered by this document.This Document is complete only when combined with the requirements of SAE J1657 "Selection Criteria for Retrofit Refrigerants to Replace CFC-12 (R-12) in Mobile Air-Conditioning Systems."