These little "POT METAL" fittings are a real POS
The easy way to get one out is to remove the crossover from the engine.
If the fitting is not already broken off, saw the thing off close to the crossover with a hack saw.
Now with a small die grinder (do more or hobby grinder) with a 1/8th --3/16 ball bur grind through the inside of the quick connect fitting until you just see the beginnings of the threads starting to show. ( BE careful and dont go too deep)
once you get one side done, flip the thing over and do the same on the opposite side.
Now with the Xover held secure, use a hammer and a small sharp capping chisel and place the sharp point at the junction of the fitting and the edge of the xover.
Tap with the hammer and drive the piece inward to free it from the threads. This will take just a few taps and then remove the other half the same way.
Now run a pipe tap through the threads to clean out the crap and your good to go.
Forget easy outs, the sealer used on these fittings effectively bonds the little critters into the hole and the easy out will not usually remove them.
The easy outs tend to expand the fitting and help to bind them harder.
Just cut them out and you can be back up and running in short order.
Use a NAPA steel replacement fitting with a little silicone sealer on the threads and your good to go.
The aluminum lines can and do corrode where they enter the old fitting. Many times a little sanding of the seal surface with some 400 abrasive paper will save the line.
If the seal area is badly corroded, a new line will be needed.
This job is not all that bad. I have salvaged several water crossovers in the past few years.
Recently fixed one for a friends truck (dual stat unit ) $$$$$$$ to buy a new one
This is the only method that I have found that works 100% of the time.
I dont even try to remove the fitting with a wrench if they have a lot of miles, just cut them out.
Missy
I was reading to far into it there... 
