Hi all,
Doing an evac of my a/c system.

Here is the manifold gauges I have. (also seen in attached pic)
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=92649

I hooked the blue hose up to the blue port (low side).
I hooked the red hose up to the red port (high side).
I hooked the yellow hose up to the vacuum pump.

There are 4 valves in total on the gauges.

1 at the high port connection to the car.
1 at the low port connection to the car.
1 high (red) dial on the gauges.
1 low (blue) dial on the gauges.

When I am evacing the system which ones should I have open and which ones should I have closed?

Thanks!
-Ryan

Attached Thumbnails