Q: Overheating and hissing

您说冷却液大约一半。知道您在哪里检查冷却液水平是一个重要的细节。您是在卸下散热器盖后检查冷却液溢流水罐还是散热器。另外，您应该在冷或至少冷却时检查它。检查它是危险的，不是很准确。

If the coolant level in your overflow jug isn’t necessarily an accurate indication of the rest of your cooling system. If the coolant level in the radiator is half full, then you have a coolant leak and have been lucky you haven’t experienced overheating until now. Either way, your vehicle is overheating and will need to be repaired.

If the cooling system is low, then you will need to locate the leak and fix it. I would also recommend replacing the thermostat as well.恒温器当汽车过热时，通常会损坏。因此，更换它可能有必要。至少是一个好主意。

如果冷却系统已满并且汽车过热，则可能需要恒温器或水泵叶轮可能发生故障。无论哪种方式，我首先要确保冷却系统在冷时填满并检查以确保恒温器按应有的打开。这可以通过从寒冷中运行电动机，接触恒温器进食的散热器软管，并等待软管变热。当变热时，恒温器已打开。最准确的方法是使用红外温度计。这样，您可以在汽车变暖时监视实际的发动机温度。如果达到华氏220度以上，并且该统计数据尚未打开（散热器软管尚未变热），那么您可能会遇到恒温器问题。

如果您的水泵叶轮有问题，这通常是生锈冷却系统的结果。但是众所周知，水泵叶轮会以其他方式失败。无论哪种方式，您都需要测试冷却液流量。这是通过拆下水泵旁路软管，冷却液吹管软管或加热器软管并启动汽车来完成的。如果您这样做很热，请小心。您应该看到冷却液从卸下的软管中出来。当然，请准备好一团糟，并在以后清洁冷却液或清洁冷却液。除非您将电动机换成，否则不要指望您从房屋中遇到的压力。如果几乎没有流动，我会怀疑水泵. But keep in mind, choosing the correct hose to test for flow takes and understanding of the dynamics of a cooling system. They are different for every vehicle.

There is also the possibility of failed head gasket. But these motors are not known for that, so I wouldn’t expect it, unless you have driven it to far with a low coolant level. If you have, every vehicle is prone to such a failure.

I’d recommend having your car looked at by a certified technician, they will be able to诊断您的过热症状亲身并进行必要的修复，以使您的汽车正常运行。

祝你好运。我希望我对你有帮助。