The AC on my 2 month old MX 75D decided to stop working today. There was a loud hiss coming from the vents and only warm air. Drove straight to the SC in Bellevue, WA and handed the car off to the techs. Hopefully it will be fixed soon. On a positive note, I was given a MX 90D that I'll be driving around this weekend. I heard that the O ring on the refrigerant can fail (saw it on a Bjorn Youtube video). I wonder if this happened to my MX?