>From: Kim Brennan

The compressor discharge (compressed gasses) goes to the front of
the vehicle to the condensor which sits in front of your water
radiator. In a work system, the compressor discharge will probably
be hot to the touch.
The expansion Valve is in hose as it enters the evaporator. That
device (evaporator) sits in the passenger cabin and passes warm air
over a heat exchanger (radiator like device) to absorb the heat of
the cabin (providing cooler air).
The drier sits on the line returning from the condensor. It's
purpose is to remove any stray water in the system.
The compressor suction side comes from the evaporator. It is usually
cool to the touch. It contains gases which have absorbed heat from
the passenger cabin.

So if I am reading this correctly then this should be the order:

1 - Compressor Discharge side
2 - Condensor
3 - Drier
4 - Expansion Valve
5 - Evaporator
6 - Compressor Suction Side

Michael Knight
'77 Westy Deluxe, "el Verde"
'85 Vanagon GL, nameless
http://photos.yahoo.com/electrictrain@sbcglobal.net