Just a suggestion for a really slick way to plug off the rear heater
lines.  I had a baypass loop in place but have always wanted to redo my
fix after reading how this could short circuit the flow to the front
heater.  Found these brass barbed plugs at the local big orange box
store and installation took all of 5 minutes using the existing spring
clamps, 3 of which were getting the cover (not sure why I had that in
there still) off.  Hope this helps someone else...

http://www.homedepot.com/Plumbing-Pipes-Fittings-Valves/h_d1/N-5yc1vZbqpfZ1z114x6/R-202300068/h_d2/ProductDisplay?catalogId=10053&langId=-1&storeId=10051

Gregory Smith
'88 Vanagon GL
'77 Lancia Scorpion

gregoryfsmith.com