 So I did a pressure test on it, and I only did it for about a half hour. But it held pressure the whole vacuum. I mean, I did a vacuum test. Well, with an Expedition, if it was a little low, it may be that it's leaking just during the winter and the cold months. And what happens on those is they use an O-ring on the radiator hoses and on the heater hoses. Instead of just the old traditional rubber hose with a big steel clamp or even a spring clamp,