Cooling System Fitting Removal Help Needed

pipe extractors are like EZ-outs for stubs. Drill and tap in then cross you fingers and turn them out after soaking in PB on the outside only. If this just strips inside due to rust or corrosion, tap the sides in with a drift and just keep going until you finally break it into pieces and pick out, then chase the threads. Somewhere it was mentioned that if you heat both with a torch and then hit the stub with some Freeze, itll break the bond, or hit the hot threads with wax, its supposed to draw in like solder and eaze removal.