<https://www.feoa.net/threads/potential-a-c-line-blockage.117221/>
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"I have a 99 ZX2 and the A/C recently started blowing ambient temperature air. I'm trying to locate the problem and need some help since it's not one of the usual suspects of A/C problems.\n\nThings I know aren't the problem:\n\nA/C compressor, it's cycling and building pressure just like it should be\nFreon, I have a gauge it's well within the expected pressure range\nBlend door, the blend door is mechanical, so I can hear it moving and it definitely shuts off the hot air when I turn it to cold\nAny switches (pressure switches, CCRM, etc), as I said above, the compressor is running and cycling on and off just like it should\n\nWhere I suspect the problem is:\nI measured the temperature of the lines in various places with an infrared thermometer after running the A/C for about 5 minutes. The high pressure lines (liquid line) right off the compressor gets up to about 135F and as labeled below in the picture, before the condenser it's about 115F, after the condenser is about 90F. All of this seems pretty normal to me at this point. But right before and after the hood switch, there's a huge temperature difference. Then by the strut tower it's starting to warm back up again. The low pressure lines on the other side of the car are whatever temperature the engine bay is.\n\n\nGiven all this, I suspect there's some sort of blockage and the Freon is decompressing (and cooling) before it should. Then it warms back up to normal air temperature by the time it gets to the evaporator. I took this apart once and found just inside the stainless colored line was this.\n\n(Sorry about the blurry picture). There's a vertical bar and a steel ball of some sort that appeared to be mounted in there, so I assume they're supposed to be there. This is where my knowledge of A/C runs out. There was also some foreign material in there, which you can barely see around the edges. I blew this out with my air compressor at 120 psi in both directions, which I thought did the trick but I still have the same problem.\n\nMy questions are:\n\nDoes anyone know if that bar and ball are supposed to be there and what they do?\nIs it likely there's some sort of a blockage in that line I need to get cleared out?\nWhat else could it be?\n\nI haven't been able to find this line anywhere (except RockAuto but the picture doesn't match the shape of this line so I don't really want to buy it just yet). I don't think there's much of a chance of replacing it.\n\nThank you for your help."
<https://www.feoa.net/threads/potential-a-c-line-blockage.117221/#post-1120945>