Edouard wrote:

Hi, we had a 99 HR Endeavour 34cg for 12 years, bought new in 98.

You need to remove the upper inverted cap on the roof toilet vent, by just breaking the little upright legs that keep it on, they became brittle over time, a few snapped when bumped when washing the roof.

You do not have to remove the caulk to get to the open pipe. I replaced the inverted caps on ours, and just slipped on new ones that I bought at the RV store, no need to break the seal at the roof surface.

The replacement inverted caps had a metal type spring which slides into the vent pipe itself with jagged edging to hold it it place.

Doing it this way does not interfere with the vent/roof seal, a great quick fix. Eugene.

Jim@HiTek wrote:

Um, really seems to me to be something blocking or wrong with the vent. I'd climb up on the roof, remove that crappy rounded cover that came with it and grab onto the vent pipe, gray and black, and tug on them. They should be glued in place. If one of them moves...there's the problem. If neither moves, THEN put the water hose in the black & gray tank vents and turn it on low.

You could also get a long 1/2" dowel or something similar, flush the black tank, add water and a bottle of red dye, then drop the dowel down there and see if it's red on the end when you pull it up again...proof that it's not a 'forgotten' vent hole.

Leave the old vent covers off and replace with simple plastic 'T's available from Home Depot. In my case, I had the odors but usually when I drove. Adding the 'T' to the roof vents solved it. Your problem seems a little more complex.

sowego wrote:

With most coaches you don't have to crawl under them to see the floor under the toilet and the top of the black tank. All side panels on your coach that are not doors can usually be openned by removing a couple of screws that hold the doors in place with small brackets. A call to your coach manufacturer will confirm where the tanks are located on your rig and which panel to remove to easily access that area.

good luck...hope you find the problem.

Canadian Rainbirds wrote:



Had a similar ongoing odor problem that seemed incurable. We had the flooring replaced, which involved re and re of the toilet including of course a new floor gasket. 3000 miles later and still no smell.

KlipschHead281 wrote:



When I look at the toilet I didn't see how it was mounted. Since I have more time tonight I'm going to take a good hard look at everything.

It's a ceramic toilet, do they use wax gaskets like in a home?

KlipschHead281 wrote:



Great ideas, thanks, will use the hose method when I get the vent cap off. I would prefer not to use any chemicals if possible so hopefully this all works and we can just enjoy the RV soon.