I'm new to this forum:
I have 1988 Toyota Tioga Motorhome. The problem is when I fill up the right compartment kitchen sink and drain it, water will burst up/ overflow in the rear bathroom sink. When I fill and drain water from the left compartment sink, this doesn't happen. How do I diagnosis the problem?
I'm guessing the air vent that connects to the right side plumbing of the sink maybe clog? Not sure how to test this but thought maybe I can get some help before I start taking things apart.
If there is a thread I can post this, please direct me. Thanks again!!
Jay