<<The high pressure line goes from the front (in relationship to the
van) of the compressor toward the front of the van to the condenser- it
returns through the dryer to the expansion valve.
The low pressure line is a short piece that runs between the expansion
valve and the compressor thru the driver's side rear pillar.>>

You have this all backwards Robert, which could lead to a guy blowing
his hands off, with shrapnel  when charging the AC system.

The low pressure port is on the back of the compressor, the high
pressure port is buried behind the rear pillar cover in later model
Vanagon's.

The bigger diameter line's are always the suction side, the smaller the
pressure.

RC