2003 Oddyssey with ~ 50K miles. The smell is difficult to describe, the best I could come up with is some kind of plastic smell. The first time I noticed it was after coming back from work, I had to drive the kids to somewhere, when the kids and I entered the still warm car and started the heat, we all smelled this strange smell. It did not occur for a few days and then today it showed up again. I heard antifreeze smells "sweet" but this smell does not seem that much "sweet", though I have no experience smelling the antifreeze. Any suggestion to help diagnose this strange smell? Thanks!