I had no idea how important changing these things is. The HVAC in my mom's Impala hasn't been performing very well recently, and the air conditioning hasn't even been superb. I thought, what the heck, I'll check the cabin filter. Her car gets parked under a pine tree often. Good lord; it was completely clogged. After changing it, it's like night and day difference. Much more airflow, the A/C seems colder, and where as we'd have to keep the fan setting quite high, now it can stay very low. I'll definitely be changing those cabin filters more often.
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