I recently installed two identical Nordyne units in a new house. Both work fine, but one liquid line gurgles. Since the line set is in an interior wall, it is a little disturbing. I have six Nordyne units in one of the buildings where I work. I have the same senario. One out of the six gurgles. The units were installed two years ago; I only noticed this while doing PM work. I assumed it was low on gas. I hooked up my gauges, checked supeheat and subcooling, everthing checked out so I just left it. Works fine, but I'd like to get to the bottom of this before useing any more Nordye junk. Just try checking the subcooling on one and you'll see why I call it junk. Any help appriciated.