Anyone has experienced this problem before?

[moonluv810]

I think there's something wrong with my climate control. Even when I activate indoor circulate air, I still can smell outside odor. What can the problem be?

I plan to replace the microfilter this coming weekend. But I don't think a mildly dirty microfilter (17k miles) can cause this.

Any thoughts?

[HR-M3]

I'd say the damn thing is malfunctioning. Can't see the filter having any effect on this. Probably some flap inside the ducts isn't closing properly. Guessing...