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I had to take my glove box completely out to access the cabin air filter in my 2017. GM didn't move it, just made it unnecessarily difficult to get to.
 

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IMHO, the cabin air filter is a marketing scam. I breath the outside air unfiltered all the time. Why do I need a filter when I'm in the car?
It actually is used to filter out odors from the cabin during recirculation. It also keeps leaves and stuff from getting sucked into the blower. It's amazing how small a hole a wet leaf can be sucked through.
 

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I changed my cabin air filter every 2 years of service and the filter media was always absolutely black. Shows how much road dust/asphalt dust etc. is in the air.
You should check it every year, and in your case I'd recommend changing it every year. Dirty and clogged filters force the HVAC blower motor work harder.
 
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