What the Libra zodiac sign is all about: Libra is the seventh of the 12 zodiac signs, which begins its cycle in early fall every year during Libra seasonâwhich falls around September 23-October 22.
How it works. This schematic shows the component parts of a typical leak-down tester. The gauge on the right is held at a standard pressure by adjusting the pressure regulator while the gauge on the left shows an example reading of 85-or 15% leakage.
Re: A/C leak from low pressure port. The A/C machine pulls the system under a vacuum, connected at the high and low ports...meaning it can hold vacuum fine, but if the fittings are leaking you will not detect it with a vacuum test.