Sorry to dig up an old post but figured I should post the final verdict. Travelers was right. They ended up replacing the compressor and so far so good. Although it's a little loud when it kicks on (similar to a blow-off sound), it's stayed cold. Peace.
2006 Mustang GT Losing Freon and weird knocking sound
My car's still under warranty and I've taken it to the Ford dealer twice to fix this issue but it hasn't stayed fixed. My A/C keeps slowly losing freon. When it blew cold, there was a loud bang that would come through the firewall when I was at an idle almost everytime I'd come to a stop. I could feel it in the pedals. As it lost freon over time, the bang would go away. It seems realted to the compressor kicking on but I can't figure it out and neither can the dealer. They've replaced the schrader valve once and a condenser line the other time. I think they're just guessing. Has this happened to anyone else?
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