I'm confused here, if this pipe is a heater line then why does it run underneath the car to the rear of the vehicle alongside the ASD pipes. Also why is the solid section 1/4 inch pipe .
This seems to me to be a pressure line of some sort but for what system ,I do not know.
I suppose my for my next step I will have to put the rear wheels on ramps and depanel the underside to see where it connects at the other end.
Larry

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Larry