Evaporator Core Replacement Rusted Nut

How do you replace the evaporator core in a 1995 Ranger 3.0V6? Any pictures? The nut to the accumulator is rusted on and I can not break free. Have tried every thing, PB Blaster, WD40 and heat. Any ideas? I think replacing the core is the easiest way.

Are you using flare-nut wrenches? A pair of the proper flare-nut wrenches should break the fitting, unless it's totally fubar'd. These are 6-point box ends, slotted to go over the line. With one wrench on the flare nut and the other one on the fitting you can get the leverage that's needed to break it loose, without slipping or boogering the parts.

Removal

1. Discharge the refrigerant from the A/C system. Observe all safety precautions.
2. Disconnect the electrical connector from the A/C cycling switch located on top of the suction accumulator/drier.
3. Remove the A/C cycling switch from the suction accumulator/drier.
4. Disconnect the suction hose from the suction accumulator/drier and cap openings to prevent dirt and/or moisture from entering.
5. Disconnect the condenser to evaporator tube from the inlet tube using the appropriate spring lock coupling disconnect tool. Cap the openings to prevent dirt and/or moisture from entering.
6. Remove the screws holding the service cover to the A/C evaporator housing.
7. Remove the service cover from the A/C evaporator housing.
8. Remove the A/C evaporator core from the vehicle.

Installation

1. Position the A/C evaporator core in the A/C evaporator housing.
2. Position the service cover into place on the A/C evaporator housing.
3. Install the two dash panel mounting nuts.
4. Install the screws holding the service case half to the A/C evaporator housing.
5. Install the suction accumulator/drier into the bracket (3 screws), then install inlet clamp (1 screw).
6. Connect the condenser to evaporator tube to the A/C evaporator housing inlet tube.
7. Connect the A/C manifold and tube to the outlet side of the suction accumulator/drier. Install two new specified (special material) 0-rings, lubricated with clean refrigerant oil, onto the male fitting.
8. CAUTION: DO NOT use a wrench to tighten the A/C cycling switch. Install (screw) the A/C cycling switch to the suction accumulator / drier and tighten finger-tight.
9. Connect the electrical connector to the A/C cycling switch.
10. Charge the air conditioning system. Observe all safety precautions.
11. NOTE: When the battery has been disconnected and reconnected, some abnormal drive symptoms may occur while the powertrain control module (PCM) relearns its adaptive strategy. The vehicle may need to be driven 16km (10 miles) or more to relearn the strategy. Connect the cable to the battery negative (ground) terminal.
12. Check the air conditioning system for refrigerant leaks and proper operation