orifice filter location

Does anyone know where your orifice filter location is I have taken apart my ac system and I have not found an orifice filter in my liquid line that goes to my coil I have not found on in my accumulator or my accumulator line that hooks up to my compressor and I have not found one in my high side line that hooks up to my condensor. So the only places left are in my compressor, in my coil in my firewall, or in my condesor in front of my RAD right? WTF? Does my car even have one? 90 gt vert factory AC
 
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