Procedure notes
Checking the engine coolant (also known as antifreeze) level in your 2021 GMC Sierra 3500 HD is pretty easy. In order to get an accurate reading, your 6.6 liter engine should be cool to the touch when you check it. Engine coolant / antifreeze circulates through your engine to keep it cool in the summer but won't freeze in the winter. The video above shows you where the coolant reservoir in your Sierra 3500 HD is located and how to check the coolant / antifreeze level. If you need to add anti-freeze, be sure to check your owners manual to determine the correct type of coolant to add - in GMCs, it usually located in a section titled Fluid Capacities towards the end of your manual. See our video on how to add engine coolant for tips on adding coolant to your Sierra 3500 HD.
Always wear safety goggles when working on your Sierra 3500 HD. Taking off the coolant reservoir cap on a warm engine could cause the cap to up explosively and fluid to spray out of the reservoir. If you notice an oily surface in your coolant, immediately have your mechanic inspect your Sierra 3500 HD for head gasket leakage.
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检查你的 2021 GMC Sierra 3500 HD 的发动机冷却液（也称为防冻液）液位相当简单。 为了获得准确的读数，检查时您的 6.6 升发动机应摸起来是凉的。 发动机冷却液（防冻液）在发动机内循环，在夏季帮助散热，在冬季起到防冻作用。 上述视频展示了您的 Sierra 3500 HD 车型冷却液储液罐的位置，以及如何检查冷却液/防冻液的液位。 如果需要添加防冻液，请务必查阅您的用户手册，以确定应添加的正确类型冷却液——在 GMC 车型 的手册中，通常会在末尾的「液体容量」一节中说明。 参见我们关于如何添加发动机冷却液的视频，获取为您的 Sierra 3500 HD 添加冷却液的建议。
对 Sierra 3500 HD 进行相关作业时，请始终佩戴护目镜。 发动机尚热时打开冷却液储液罐盖，可能导致罐盖突然弹起，并使液体从储液罐中喷出。 如果发现冷却液中出现油状表面，应立即请维修人员检查您的 Sierra 3500 HD 是否存在气缸垫渗漏。