Does anyone know how to access the orifice tube? I think I figured out where it is located, but can't get the connection apart. There's a tube leaving the condensor on the passenger side. it runs back close to the accumulator, turns downward and enters the heater box / evaporator. After it turns downward there's a connection that appears to be held together with a spring clip. The connection twists, but won't pull apart even with the spring clip removed. I don't want to break anything, can someone please verify if this is the right location & how it comes apart?
1997 F250 XLT SC/LB AT Powerstroke 4X4 all stock