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You did not mention evacuating the system (using a vacuum pump) of air and moisture before you refilled it with R134. There are good reasons to do this. First, it allows you to check for leaks. If the system will not hold a vacuum, there's a leak and the system will not hold the R134 either. Also you need to get air and mosture out of the system that entered while the system was open. While the system is open, it's usually a good idea to replace the O-Tube and the accumulator also.
I had a leak once around the O-Ring on the pressure cycling switch on the accumulator. Fortunately, I caught it with the vacuum pump before refilling the system.
If you want to do a super job on your A/C, then after the system is empty and open, flush it out thoroughlywith A/C flushing solution, replace accumulator and O-Tube, add the correct amount and type of oil, close the system back up and then evacuate at least 1 hour and then refill. Yes I know it's a lot of work to do all this.
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