yeah, i tested the old one and it opened. But i've been told by a mechanic that its different if it gets hot from both sides like when you drop it into a jug of boiling water compared to just one end when its installed in the car. In the car it would only heat a specific area of one side.
and no, i installed it fine. just like the factory one and no gasket glue was on it when i pulled it out to take to nissan. Which reminds me i should go back to nissan and get that new one back before they forget about it....