[onewhippedpuppy]

I vacuumed for 30 min, but turned it off and let it sit to ensure that it held vacuum.

Matt, that's the correct expansion valve for the front, but I don't have one in the rear. That's an option for the 9000, mine does not have it.

Tim, the low side line is warm, vent air does not appear to be cooler. Thermometer indicates it's about ambient coming out of vents.

So right now, I'm planning on replacing the expansion valve, then vacuuming down and recharging. Obviously I'd have to anyway after opening the system. It's only $28, and pretty much the only thing I can think of.