本段视频演示车型：2020 宝马 840i xDrive Gran 轿跑车 3.0 升 6 缸 涡轮增压
操作说明
学习如何冲洗您的 2019 宝马 740e xDrive 的冷却液（防冻液） 冷却液/防冻液流经 740e xDrive 的散热器和发动机，以维持适当的温度。 冷却液/防冻液也会流经位于车头罩内的暖风水箱，为您的740e xDrive车厢提供热量。 除了防止车辆过热外，冷却液/防冻液还能润滑水泵和软管中的密封件。 开始冷却液冲洗作业，首先将储液罐内的冷却液/防冻液排出，然后打开放液阀或拆下下 radiator 管道，排出散热器内的冷却液。 本视频展示了 2019 宝马 740e xDrive 车型散热器放液阀（放液阀）的位置。 向散热器中加入蒸馏水，并启动发动机。 关闭发动机，排出水，向散热器内加入防冻液，直至形成 50/50 冷却液/蒸馏水混合液，并排出冷却系统内的空气。
就像你的740e xDrive里的机油一样，冷却液随着时间推移会变脏，失去冷却2.0升发动机的能力。 当你对你的 2019 进行冷却液冲洗（即防冻液冲洗）时，会将所有的旧的脏冷却液排出，从而避免将来出现昂贵的散热器和冷却系统维修费用。 上述视频展示了您的散热器上放液阀的位置，如何冲洗冷却液/防冻液，以及如何排出冷却系统内的空气，以确保您的 740e xDrive 正常运行。
冷却液有毒，动物会被冷却液（防冻液）的甜味吸引。 当你冲洗740e xDrive的冷却系统并更换冷却液时，如果洒出冷却液，务必铺上猫砂吸收，以便清理。 定期冲洗冷却系统并更换冷却液，可以清除发动机中的污垢和矿物质沉积，并延长暖风水箱、节温器、软管和水泵的使用寿命。
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Learn how to flush the coolant (antifreeze) in your 2019 BMW 740e xDrive. Coolant / antifreeze circulates through 740e xDrive radiator and engine to maintain the proper temperature. Coolant / antifreeze also passes through the heater core under your cowl to provide heat to the cabin of your 740e xDrive. In addition to preventing your car from overheating, coolant / antifreeze also helps lubricate the seals in the water pump and hoses. Start your coolant flush by draining the coolant / antifreeze that is in your reservoir, then drain the coolant that is in your radiator by opening the petcock or removing the lower radiator hose. This video shows where the radiator drain plug (petcock) is located on a 2019 BMW 740e xDrive. Fill up the radiator with distilled water and run the engine. Turn off the engine and drain the water, fill up the radiator with antifreeze until you have a 50/50 coolant / distilled water mixture and burp the system.
Like the oil in your 740e xDrive, coolant gets dirty over time and loses its ability to cool down your 2.0 liter engine. When you flush your coolant, which is antifreeze, on your 2019, you are draining out all of the old dirty coolant and preventing costly radiator and cooling system repair down the road. The video above shows you where the petcock on your radiator is located, how to flush the coolant / antifreeze and how to burp the system to get the air out of your 740e xDrive.
Coolant is toxic and animals are attracted to the sweet taste of coolant (antifreeze). If you spill coolant when you flush your 740e xDrive, be sure to put down cat litter to soak it up to discard it. Flushing the coolant on a regular basis removes gunk and mineral deposits from your engine, while prolonging the life of your heater core, thermostat, hoses and water pump.