Well I realized putting a BB in the line would be stupid, especially as that's the line that goes to the vents beneath the windshield and seems fine.

My problem must be in that unit/s behind the CCU somewhere, but I realized I wasn't sure how to test it, exactly, so I will research that a bit and try again another time.

__________________
Ralph

1985 300D Turbo, CA model
248,650 miles and counting...