Got the car not long ago and the ac doesn't work. Tried to refil it with freon but it autmatically read that the preassure was high on it. So it drained it from the high pressure valve, and refill. It went from very low to very high in a second or two. I can't hear the compressor kicking on at all, ran the self diagnosis test but it didn't throw ant dtc's. Is there anything else I can check before I chalk it up to the compressor going out??