You have a small gas leak, when you do the void you do not detect it because it is very small, you must check the connections with nut, the condenser, it is the one that is next to the radiator and the evaporator that is the one that is entered or under the board. The blow that is heard and possibly some steam comes out of the cold is because gas has already lost and no longer has its normal load and the evaporator begins to freeze precisely due to the lack of gas.
I hope you soon located La Fagua. GREETINGS.