The low side fitting is probably behind the plastic in the pillar on
the left side (drivers side) of the D pillar (i.e. that pillar
immediately to your left when you open the rear hatch.

It if was converted to R134, it should probably have a blue cap. The
high side is a red cap. Black cap on schrader valve (like a tire valve)
is the R12 style connector (it should have been replaced with the quick
connect fittings when it was converted to R134).

The first thing is to check the pressure. If the pressure is okay, then
you can start looking elsewhere (like fuses, thermostats or wiring.)

On Monday, July 21, 2003, at 03:32  PM, Debra Clark wrote:

> care of some problems with my 90 Multivan.  The A/C is not blowing
> cold.  It was converted to 134-a in Feb. 2002 so I think it might need
> more refrigerant.  I have the refrigerant and a gauge but where do I
> hook up?  It seems that the readily available connector at the top of
> the engine compartment is on the "high" side.  Am I wrong?  Where is
> the low side connector?