Originally Posted by ETF
I can't see one in my 3011DS. I did find the one in the water filter/pump compartment.
We don't do much cold weather camping but we were caught over New Year and I learned some things so I'll be better prepared next time.
The duct that serves the water pump area will "spill over" via the air gaps around the waste tanks. I was also camping during the "Hercules" winter system and I was checking my enclosed sanitary waste valve area while the furnace was running, I could detect the slight warm air coming from the other side of the coach.
My gray water waste valve ended up frozen shut when it got down to 14 degrees, but the gray tank was also near empty at the time. No problem on the black tank valve but its a bigger valve though.
I can add two items to watch for in sub freezing temps.: make certain there is no drop/dip in the sewer hose. Even though my waste valves were closed I kept the sewer hose connected. Well where the hose connected into the campground sewer, it had a slight step up which created a shallow low spot in the sewer hose. Water collected in that area and froze solid. I had to use a hairdryer to thaw the ice plug in the sewer hose.
The other tip; we had rain before the snow came then the temps dropped fast. Our patio mat literally became part of the concrete camping pad. The patio mat was still very wet when the temps dropped well below freezing. We weren't the only ones trying to pry a patio mat up. Then it became interesting as to now what to do with the solid sheet of 9 X 12 patio mat. I poured enough hot water from the coach over the mat to get it to at least roll up then strapped it to the bumper.