I have a sewer vent coming out of the house that smells bad, I snaked the drain from the clean out to the street and it is clear. Would another blockage somewhere be causing this or something else? Reason I know about the smell is I have a swamp cooler on the roof and it blows into the cooler.

I have a sewer vent coming out of the house that smells bad, I snaked the drain from the clean out to the street and it is clear. Would another blockage somewhere be causing this or something else? Reason I know about the smell is I have a swamp cooler on the roof and it blows into the cooler.

A Odor Hog Vent Cap,(see image) might be just what you need, Check them out at; OdorHog(tm), roof vent pipe filter that stops septic tank odor. 1-800-963-6746 (http://www.odorhog.com/).
Let me know if this works for you. Good luck, Tom