In Cabin Air Filter

I have an 04 Trailblazer and I have a 2 part question,
1) How do I know if their is an in cabin air filter?
2) where would it be??

Thanks.

PS for those of you whos gague cluster died or went nuts like mind did....their cheap on EbAy and only about a 30 min install. My dealer wanted 1200 for a new one.

Question#1...no
Question#2....see #1

enjoy the truck
Rob