Where is the orifice tube? 2001 WB Venture

I'm unable to locate the A/C line in which the orifice tube i located. Please tell me its not inside the line that the pressure sensor is on (just underneath the air filter. I cant even get a wrench in there. I'd appreciate and help in locating and tips for replacing it. Thx

what are you trying to do?

I would like to locate it, remove it, check for any blockage, and replace it if needed. I've read of others changing this out but none went into great detail as to were and how.

I'm getting a new ac compressor next payday, and want to check everything I can. No point in putting in a new comp, evac and recharge if its blocked. Know what I mean Vern?