Quote:
Originally Posted by BillGrissom
.....Don't go by the sight-glass. That is for R-12 and only a sanity check for at that. Judge by the pressures. .....
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The FSM Rejects the use of the sight glass even for R12..... there are times they warn... that even totally full the sight glass will show bubbles... causing one to over fill if using that as your indicator.... about the worst thing you can do with an AC system as it works on the difference in pressure between the high and low sides...