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That pipe is part of the front evaporator. You can replace either the the evaporator and blower box assy, or just the evaporator.
It really looks like the bubbles are caused by air pressure within the box while the fan is running, and being forced out of the pipe penetration.
Hmmmm.... I think I'll just replace the evaporator. Maybe I can pull one off at the junkyard, might give me some practice with removing it. The system is empty now anyway. Thanks!
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Leaking AC pipe help
