A/C questions

[George Selby]

It's starting to get warm here in Eastern NC, and I need to get the A/C 
working on my black interior, black exterior 90 200t.  The first question 
is where is the low side recharge port?  I've found the high side port, 
located right in front of the radiator.

Second question:  According to the diagnostic display on the climate 
control unit, the low side switch is keeping the compressor from running 
(and thus my need to find the low side recharge port so I can charge the 
system.)  However, if I jump the low side switch, the compressor still 
doesn't come on, and the diagnostic display indicates that it should be 
running.  If I apply 12V directly to the compressor, it does come on, so I 
know the clutch works.  Last question, which relays should be installed in 
the fuse box.  #6 and #11 both indicate they are A/C relays, and neither 
one has a relay in it.  I have tried putting an appropriate relay in one, 
the other, or both, and the A/C compressor still doesn't come on (when low 
side switch is jumped over.)

George Selby