I'm trying to locate the low-pressure port on my '95 Previa in order to
attempt to boost the refrigerant  level with a store-bought recharge kit.
I've already had the van to the Toyota mechanic and had a $1350 diagnosis
of changing the dryer and compressor as they claim it won't hold a charge.
I'm simply trying to go the cheap $25 route to see if I can possibly seal
the leak and improve the quality of the tepid air somewhat.  The van has a
non-supercharged 2.4 engine and the system has the rear air feature also.