Find a Frostheater write up here with description/pictures. It's 3/4'' OD, front of engine compartment, driver's side, low on the block. Beyond that I don't recall much.
Jetta Wagon TDI 2K3 Silver has gone to a new home, replaced by Behemoth 2012 BMW X5 35diesel. Jason T. Daniels Is my 55 mpg guru.