No, what he is saying is that your manifold hose is not engaging the schrader valve on the AC system, so no refrigerant can get in. You need to screw the hose down all the way to make sure that it is opening the valve. If it's not working, there is something amiss with your fittings.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition