We have an 08 Thunder, bath and a half, and we are experiencing horrible smells in the coach, under the kitchen sink, and shower area. It seems to get worse when the gray water tank is about 1/2 full or more. I dont use the grinder (as I call it) and I keep both valves closed to make sure when we dump the tanks there is enough water to flush everything out. I check the breather valve under the kitchen sink, it was closed. But I wonder if it is not opening when we flush the toilets........we have the senca toilets with jets to shoot the water across the coach to the holding tanks. I am beginning to wonder if there is not a design flaw with Monaco coaches not having proper breathing to the overhead vents. Anyone experience similiar events? I am all ears........................
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