vic wrote:
The venting cap on my kitchen sink is overflowing water when my
dishwasher (GE Potscrubber) goes into the rinse cycle. I assume
there's a partial obstruction somewher in the dishwasher hose.

Pull off the hose between the air gap and disposer. Chances are it's
clogged. Clean it out or replace it and you'll be in good shape.