quick q, is it std to vac the AC system with hi and lo ports open on manifold? i ask because i see several u tube videos showing it this way, i dont see issue for AC system itself, but what about the hi side gauge on manifold, they typically have a needle stop at zero psi.
Pulling a vacuum with both side open is fine. Only charge thought the low side unless you have a charging station.
what about the gauge though, the low side allows vacuum (by way of allowable needle movement), the hi side doesnt.
They are designed to take negative or below zero movement.
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