[QUOTE=Submariner409;3305239][QUOTE basscatt] the PURGE LINE is unique to Northstar motor

Not quite
- my two F-150's, with separate coolant reservoirs and 18 psi caps, have purge lines that operate the same way as the Northstar setup. I would imagine that the system holds true for many vehicles with divorced reservoirs.

Here's the 2004 4.6 4X4 setup. The "FULL COLD" legend is the funny looking black blob on the front side of the "degas bottle" (???).
I concur...the degas bottle is pretty much the norm on anything designed within the last 2 decades. Definitely not a N* unique design...