samiam4,

You left out a VERY important step, evacuation. You MUST draw a vacuum long enough to remove the vast majority of moisture. If you don't it won't cool very well, but more importantly the remaining moisture will combine with the refrigerant to make an acid that will eat up the system from the inside out. Also for a converted system you should use Ester oil NOT PAG oil.

That said, I would NOT convert to 134 if you are in a warm climate.

Good luck,