Thank you for the help! I was able to drain the coolant, remove the faulty part, and fit the new part without major issues. I used a vacuum filler from Harbor Freight (per the FCP Euro and other forum guidance). Vacuum Coolant Fill Tool Options https://www.fcpeuro.com/products/pneumatic-vacuum-coola...

I've got the same leak! Diagnosing currently... Here goes a YouTube video that looks like the same issue... https://youtu.be/AxCvSsmUMSw?feature=shared FCP Euro Part, Volvo HVAC Heater Hose - Genuine Volvo 8641078, https://www.fcpeuro.com/products/volvo-coolant-pipe-adapter-genuine-volvo-31338581 I'...