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OK , that was a pretty close description of what I said...
When I mentioned the FSM I was talking about the warning as to using the sight glass as the first and/ or reliable method for determining whether to add freon to a system.
The MB FSM on AC warns that under certain conditions it may show a false ' add' indication. And since overcharging is VERY SERIOUS.... excessively working the AC system from that point forward the warning should be followed by utilizing other more reliable indicator before adding freon.
Grapir stated the situation correctly....
but remember that on that other thread the person was talking about ADDING to his closed system.... so that leaves pressure as the only way to check to see if he has the correct amount added ( in combination with vent temperature ).
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