从逻辑上如果哪里漏，应该慢慢漏，不是突然少一公升。而且你提到第一次发生是一下子开了几百mile之后，我在google上面看到这样一个case，也是别人问一样的问题，下面有人这样回答：
The first thought that comes to mind is that the coolant is getting pushed out the reservoir overflow tube when the engine warms up because of a bad radiator cap. A pressure test won't show this, because one has to remove the radiator cap to do the test! You can test a radiattor cap with a thermometer, a hotplate, and a Pyrex vessel. Simply hang the cap into the water, turn the hotplate on, and see what temperature the T-stat opens at.
像你的情况么？
The first thought that comes to mind is that the coolant is getting pushed out the reservoir overflow tube when the engine warms up because of a bad radiator cap. A pressure test won't show this, because one has to remove the radiator cap to do the test! You can test a radiattor cap with a thermometer, a hotplate, and a Pyrex vessel. Simply hang the cap into the water, turn the hotplate on, and see what temperature the T-stat opens at.
像你的情况么？
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