A/C drawing air up sink drain.
Whenever we turn on the A/C, it's just a matter of time before the whole RV STINKS. It appears the A/C is pulling air up the waste pipes connected to the double sink. Under one sink there is a drai...
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I would check the sink's air vent. This device is designed to allow air into the drain line (grey tanks smell just as bad as black tanks). If the vent flap is bad, it will allow air to exit the drain line into the unit. The vent just unscrews to remove it.
I once had a problem similar; it turned out the tank vent line through the roof wasn't well sealed, and stinky air was entering through the cracks. Stuffing fiberglass in the cracks solved that problem.
Doug
I once had a problem similar; it turned out the tank vent line through the roof wasn't well sealed, and stinky air was entering through the cracks. Stuffing fiberglass in the cracks solved that problem.
Doug
