英文回答：
Checking and replacing coolant is an important maintenance task for any vehicle, as it helps regulate the engine temperature and prevent it from overheating. In this practical training session, I will walk you through the process of checking and replacing coolant in a car.
First, let's start with checking the coolant level. I will open the hood of the car and locate the coolant reservoir. I will carefully remove the cap and visually inspect the coolant level. The coolant should be between the "min" and "max" marks on the reservoir. If the coolant level is low, I will add a mixture of coolant and water to bring it up to the proper level.
Next, I will check the condition of the coolant. I will look for any signs of contamination or discoloration, which could indicate a problem with the cooling system. If the coolant appears dirty or rusty, it is time to replace it.
发动机冷却液 Now, let's move on to the process of replacing the coolant. I will start by draining the old coolant from the radiator. I will place a drain pan under the radiator drain plug and carefully remove it to let the coolant flow out. Once all the old coolant has been drained, I will flush the system with water to remove any remaining residue.
After flushing the system, I will refill the radiator with a mixture of coolant and water. It is important to use the correct type of coolant for your vehicle, as different cars require different formulations. I will pour the coolant mixture into the radiator until it reaches the "max" mark on the reservoir.
Finally, I will start the engine and let it run for a few minutes to circulate the new coolant throughout the system. I will then check the coolant level again and top it off if necessary. Once everything is in order, I will replace the cap on the reservoir and close the hood.
In conclusion, checking and replacing coolant is a simple yet crucial maintenance task that should be done regularly to ensure the proper functioning of the cooling system in a vehicle.
中文回答：
检查和更换防冻液是任何车辆的重要维护任务，因为它有助于调节发动机温度，防止发动机过热。在这个实训环节中，我将为您介绍如何检查和更换汽车的防冻液。
首先，让我们从检查防冻液液位开始。我会打开车辆的引擎盖，到防冻液储液罐。我会小心地取下盖子，目测检查防冻液液位。防冻液应该在储液罐上的“最低”和“最高”标记之间。如果防冻液液位偏低，我会添加防冻液和水的混合物，使其达到正确的液位。
接下来，我会检查防冻液的状态。我会查看是否有任何污染或变的迹象，这可能表明冷却系统存在问题。如果防冻液看起来脏或生锈，那就是更换的时候了。
现在，让我们继续进行更换防冻液的过程。我会开始从散热器中排放旧防冻液。我会将排水盆放在散热器排水螺钉下方，并小心地取下螺钉，让防冻液流出。一旦所有旧防冻液排干净，我会用水冲洗系统，以去除任何残留物。
冲洗系统后，我会用防冻液和水的混合物重新填充散热器。使用正确类型的防冻液对您的车辆至关重要，因为不同的车辆需要不同的配方。我会将防冻液混合物倒入散热器，直到达
到储液罐上的“最高”标记。
最后，我会启动发动机，让它运转几分钟，使新防冻液在整个系统中循环。然后我会再次检查防冻液液位，如果有必要，再次加满。一切就绪后，我会重新盖上储液罐的盖子，关闭引擎盖。
总之，定期检查和更换防冻液是一项简单但至关重要的维护任务，以确保车辆冷却系统的正常运行。
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