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I am the guy that posted the question. It turned out that the expansion valve was blocked. That makes sense in terms of the pressure readings. But the reason it was blocked was surprising to me. The drier failed and allowed tiny beads to flow throughout the system. I had to have the whole thing flushed and actually, it still blocked again. We finally got it though and it works fine now. I strongly suspect that the drier problem was caused by the fact that I put a lot of stop leak plus too much freon. But I am not certain of that.

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Q: What would cause almost zero low side pressure but normal high side pressure on a 1999 metro air conditioner?
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