My kitchen drain goes glub glub. Been doing that for a couple months now. Not just when it's done draining, but when the laundry tub drains the washing machine. The kitchen drain flows into the same drain line as the laundry tub . Both are on a 1.5" galvanized vent stack that goes up inside the exterior kitchen wall on the way to the roof.
I've seen and heard this glub glub drain issue before. Galvanized pipe rusts from the inside out when it's used as a vent pipe, due to the humidity inside the pipe all the time. The rust flakes off the inside wall of the pipe and can jam the pipe shut. I've sawzalled though sections of vent stack before that look whole on the outside and are so rusted on the inside you can't see light through the end of a 2' length of them. Once the vent stack is obstructed, the drain don't pull right, hence the glub glub of water in the kitchen drain P trap as negative pressure occurs in the drain system.
This is trouble. I tried to snake it out but no dice. I suspect I'm going to have to dig it all out of the wall and replace the whole system with PVC. Wee. Drain still basically works for now, though, so it's easy to procrastinate.
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