Where is my cabin air filter and how do I change it? Comment on how bad your cabin air filter was. Is it worse than this one? Did you ever get sick from one? Do you have a #cabinairfilter This one is extra nasty. If you don't know if you have one you need to find out and stop breathing this nasty rodent dropping filled air. It's not healthy. Most cabin filters are easy to change yourself and are pretty cheap. Like 12 to 20 dollars. Some are under the cowl panel like this Ford Freestar while others are right behind the glove box inside of the car or under the dash. For clean air and healthy living, you owe it to yourself. Why spend the money for a mechanic to do it when you can do it yourself and save cash.