Hi, I have a GH refrigerator that stopped cooling, I opened the scio appendix, and some air-type gas came out, not wet or cold or with oil. weld scio valve, perform vacuum with pump at -30 psi for 15 min and leave it 30 min, did not lose vacuum, and proceeded to load r134a, breaking the vacuum, and turned on the equipment and opened the pressure gauge pass every few minutes , until he achieved about 10 psi marching. and I stay at 15 and suddenly it started to make a noise like a buzzing sound and it makes the condenser vibrate but the motor doesn't move, anyway. The pressure gauge does not cool down at 15 psi off and when you turn it on, the pressure is not at 15. THANK YOU CAN GUIDE ME ABOUT WHAT IT CAN BE.