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I just put in a newly rebuilt 4L60e in my 06 Chevy Suburban - all kinds of excellent updates, including Borg Warner clutches, aluminum pistons, updated TCC regulator valve, and much more. Filled with MaxLife ATF, and it has a Hayden 679 cooler (bypassing the radiator). ... and yet I'm getting...

What would cause a wax like residue to coat the entire coolant system, reservoir, radiator, engine, etc? I've got a black waxy residue that will not flush out. Another interesting characteristic is that the solidified residue liquifies when heated and floats to the top like oil. But goes solid...