Black tank smell/ vent plug

[pnoetzel]

Is it possible for the vent on roof for black tank to plug?. We have been getting an odor when we flush toilet.
I have completely flushed the tanks twice. It has been noticed for a couple of weeks.
Anyone had any experience with this problem.
We are on full hookup, and it has been in the +90 deg here in AZ.
Don’t know if temp has anything to do with it.
Thanks

[Keebler]

I know I have encountered odors that were corrected by changing out the Air Admittance Valve. On mine, the valve was located under the bathroom sink.

[Richter]

You also don’t want to flush when the fan is on. This will pull odors out of the tank and into the bathroom.