A/C in 88 Accord not working
 

After I had the AC retrofitted to r134 and charged, a year later it
doesn't work. Alsoo have problems with the fan switch. i learned that a
loss of pressure(below a certain point, in the system) will disable the
compressor from engaging(for those who were wondering) it does that to
"protect" itself. All i know is that i measure high pressure when the
compressor is off, and I measure low pressure when it's on. This seems
backwards to me. could i have a blockage, how can i remove one. also
when i added refrig, it did not seem to last more than a month +or-.
PLEASE HELP, MY CAR IS COOKING ME ALIVE!