Find Freon leak fix problem then recharge system with R134 36oz?

what is the question? if you lost the freon charge you still have a leak

If the A/C refrigerant was recently recharged and now the cooling capability is diminished, there is likely a leak. Was dye added when the recharge was performed? More importantly, was the system pressure tested to EPA standards to ensure it holds a vacuum? The vacuum test ensures there are no leaks otherwise ambient air is sucked into the system and the pressure test fails.