Automotive Air Conditioning Information Forum (Archives)

rstarr on Fri August 08, 2014 6:19 PM

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.

TRB on Fri August 08, 2014 6:23 PM

Pulling a vacuum with both side open is fine. Only charge thought the low side unless you have a charging station.

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rstarr on Fri August 08, 2014 6:36 PM

what about the gauge though, the low side allows vacuum (by way of allowable needle movement), the hi side doesnt.

wptski on Fri August 08, 2014 10:13 PM

They are designed to take negative or below zero movement.