Well farts. It's leaking from the sensor in the #2 hose that I swapped over. At least I found it and it's easy-ish to get to. But the real kicker is now there seems to be no AC. How could that happen?

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I am glad I found this thread! I hear a rattle from the engine bay, rather loud that I can hear from inside the car too if radio is off. It is intermittent - sometimes makes a lot of noise while idling, sometimes not.

Here is a short video recorded from the engine bay. You think this is water pump?

I bought a mechanics stethoscope from HFT and tried to poke around the WP, alternator, and idler pulleys, but couldn't hear anything solid. However, I could hear a clear rattle from the thermostat housing

https://www.youtube.com/shorts/ZhRl5QV6Rbg