Hmmm...thanks for the input. Just when I thought that FINALLY my next oil change would ONLY be an oil change!

Gailwrath, I had the same thought about maybe it not allowing air to get stale or low on O2. I'll have to go test it...maybe there is a difference between when the A/C is on and when it's not. I'm pretty sure I've definately experienced it turning off on its own when the A/C is not on and I just want to avoid the cow "perfume" along a stretch of highway. I'll check to see if it works till I turn it off when the A/C is on.

Thanks, everyone!