The very first time I did this, I screwed the lever that punches a hole into the can all the way down. Evidently this actually seals the hole in the can, so you have to let off on it after puncturing it. See if this might be what you're needing to do. Seems strange that you have 45psi and still cycling. How cold is it getting inside the cabin? If you use a small thermometer up against the center vent (close all other vents and put A/C on high/rec.) you should have about 40degree temp blowing out (that's Farenheiht!).
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.
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