Thanks for the advice, I'll give the blow test a try on the small tube at the F connector, that's the easy place to go next. Of course this morning it's 34 degrees (relatively warm) and it didn't do it. I also wonder if there might be any codes stored but no CEL/SES ... I'll give it a quick scan when I get a chance. This is really nitpicking, but since everything else on the car is working so nicely, I want to figure this out. Also I don't like to have any issues going into winter when I rely on the car a lot more. Maybe I'll replace some of the other lines next oil change...