This one runs from a thermal valve at the bank of the A bank water manifold, forward thru a check valve, then disappears down the front of the engine. It has a white stripe. Even with a car on the lift I cant find where it end. Appears to be behind the alternator.

Anyone have any idea?

 

Probably a dead end, found lots on my car intially. You can delete and plug almost all of them.

 

Further sleuthing here leads me to believe its to the air pump. As I have already removed the air rails, I can remove this line and the blue switching valve as well. If time permits I will also pull off the air pump