Rhythmic thumping noise from middle of 1605FB
We took our new-to-us 2018 Coleman 1605FB out for our first camping trip. We were closing up and heard a rhythmic thumping noise coming from the middle of the camper. Water/elec unhooked, awning in, slide in, water pump off, antenna down, still needed to dump. We took it to the dump and the noise continued. We drove it 1.5 hrs home and the noise continued. It is two thumps, then a maybe 20-30 second silence, then two thumps. It is loudest next to the slide out over the black water dump. When looking under the camper it sounds as if it's coming from the black water tank. Any ideas? Thanks!
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