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How long are your lines from your charging valve body ?
Did you purge them before starting the procedure ?
The MB AC FSM warns against using the site glass as a definitive test on most things.. and I think one mentioned which can give false readings it in the event you do not have enough forced air across the condensor...
One of the main problems with air in the system.. is that it is not likely to be really really dry air..
Thus the potential for immediate problems with regards to ice crystals occurs..
This is in addition to the acid forming effect of the mixture of water and the AC refrigerant and oils in the system... which eats at the inside of the metal tubes and flakes can come off and lodge in places like the TXvalve...
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