That's funny. When you said clogged cat I thought of a kitty cat. I was like man I gotta fish out another dead animal from my car. I has my heat on one day and heard a loud thud and the blower sounded wrong. I turned up the fan speed and my dash was vibrating hard. Thought my blower fell. Took apart the dash and blower was in tact. Put my hand in the vent thing and felt something fuzzy. Ended up pulling out a mouse.