Removing A.I.R. tube fittings from manifolds?

[jasonL78]

I was told by an old timer who was a tool and die maker. You can heat up a rusted part and then cool it very quickly with water? I did it with an exhaust pipe and I was able to twist the 2 pipes apart with my hands. So I would think it would work for your manifold also. I guess the theory is when you put the cold water to the hot surface it loosens up the rust? Not sure if you want to give it a try?

Jason