The compressor on my 96 dodge intrepid siezed. I decided to stick in a used compressor and when I vented the freon (bad) I figured I only got several ounces of gas to come out. I had 1/3 can of freon handy and hooked it up to the low side port and the compressor sucked it in. I decided to add another can and the a/c is blowing cold. I only had the system open for 5 mins at the most and I assume very little air got into the system. what is the opinion on whether or not I should have the system evacuated and recharged?