Defrost automatically kicks on the AC compressor and the idle compensator should adjust just like it does with AC on. If it is not, then the contacts in the defrost control is not triggering the relay.
As for the water, it is hot out and their will be some evaporation...but that you just filled it, you could have had an air bubble in the system (did you bleed your radiator?) and when the bubble "popped" the water took its place.
Look for leaks..if none are found, I would suppose this was the radiator situation.
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