Vehicle shown in this step: 2001 Chevrolet Express 1500 LS 5.7L V8
Source note on shared footage
We have a massive and growing video library, but we don't have everything...yet.
Car companies often use the same engines in different cars. They also slightly alter the styling and sell the same car by two different names (amongst other tricks to help offset development costs).
Our system selects the most applicable video for your car based, in part, on these characteristics. The video displayed may not look exactly like your car, but may be relevant enough for you to get a good idea how to do it.
查看中文对照 · Chinese translation
我们有一个庞大且不断增长的视频资料库，但还没有全部内容……
汽车制造商经常在不同车型中使用相同的发动机。 它们还略微调整了外观设计，并以两个不同的名称销售同一款车（以及其他一些技巧，以帮助抵消开发成本）。
我们的系统会根据这些特性，部分地选择最适合您车辆的视频。 视频中显示的内容可能与您的车辆外观不完全相同，但可能足够相关，让您了解如何操作。
Procedure notes
When the air conditioner in your 1991 GMC G3500 starts blowing hot air, you likely have a freon leak. Recharging the freon in your AC system is an inexpensive and easy first step to restoring the cooling capacity of your A/C system. Most refrigerants include a leak sealer that will seal small leaks in addition to filling the R134a freon. The A/C system in your G3500 consists of a compressor that is belt-driven, an evaporator and freon. If there is a problem with your compressor or evaporator, adding freon will not restore cooling.
How do you recharge AC in a 1991 GMC G3500? The low side AC port location is the first thing to find when you are looking for how to put freon in a car. Once you find the 1991 G3500 AC low pressure port cap, hook up the can of refrigerant to the low pressure port. When your compressor kicks on, add freon to the correct pressure. In addition to cooling, freon lubricates the compressor when it runs. Typically the AC recharge kit you buy will have enough capacity to add enough freon to get the AC in your G3500 to blow cold air.
What type of refrigerant does a 1991 GMC G3500 use? Air conditioning systems can vary so it is critical that you check the sticker in the engine bay to determine your G3500 refrigerant type. There is an AC sticker in the engine bay of your 1991 G3500 that indicates if it requires R134a refrigerant or the newer R1234YF type to do a recharge. You cannot add R1234YF refrigerant to a R134a system nor can you add R134a refrigerant to a R1234YF system. R134a and R1234YF have different low pressure port types, so you should never use a recharge adapter to add the wrong type of refrigerant. Recharging your G3500 with the wrong type of freon can make the AC recharge cost much higher!
查看中文对照 · Chinese translation
当您的 1991 GMC G3500 车辆空调开始吹出热风时，您很可能存在制冷剂泄漏。 为您的空调系统补充制冷剂是恢复空调制冷能力的简单且经济的第一步。 大多数制冷剂都包含一种密封剂，不仅能填充 R134a 制冷剂，还能密封微小的泄漏。 你的 G3500 车辆空调系统包括一个由皮带驱动的压缩机、一个蒸发器和制冷剂。 如果压缩机或蒸发器出现故障，添加制冷剂无法恢复制冷功能。
如何为 1991 GMC G3500 的空调系统加注制冷剂？ 在寻找如何向汽车添加制冷剂时，首先要找到低压侧的空调接口位置。 一旦找到 1991 G3500 空调低压端盖，将制冷剂罐连接到低压端。 当压缩机启动时，应添加制冷剂至正确的压力。 除了冷却之外，制冷剂在运行时还能润滑压缩机。 通常你购买的空调加注套装容量足够，可以添加足够的制冷剂，使你的 G3500 车辆空调吹出冷风。
一款 1991 年的 GMC G3500 车辆使用什么类型的制冷剂？ 空调系统存在差异，因此必须检查发动机舱内的标签，以确定您的 G3500 型号的制冷剂类型。 在您的 1991 G3500 发动机舱内有一个空调标签，该标签会标明是否需要添加 R134a 制冷剂或新型 R1234YF 型制冷剂进行充注。 你不能向 R134a 系统添加 R1234YF 制冷剂，也不能向 R1234YF 系统添加 R134a 制冷剂。 R134a 和 R1234YF 的低压端口类型不同，因此绝不能使用充注适配器添加错误类型的制冷剂。 为 G3500 充注错误类型的制冷剂，会导致空调充注费用大幅增加！