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2021 K5 GT Line Wolf Gray w/Red Leather
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For some reason, the a/c system automatically defaults to fresh air mode when turned on. This requires the a/c to work much harder at trying to dry and cool the air that is coming from the vents. Eventually, the interior cabin filter gets damp and can cause this smell. The a/c should always be ran in the recirculate mode. You might want to replace the cabin filter and spray ozium or something like it into the system before installing the new filter. Hope this helps.
 

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For some reason, the a/c system automatically defaults to fresh air mode when turned on. This requires the a/c to work much harder at trying to dry and cool the air that is coming from the vents. Eventually, the interior cabin filter gets damp and can cause this smell. The a/c should always be ran in the recirculate mode. You might want to replace the cabin filter and spray ozium or something like it into the system before installing the new filter. Hope this helps.
Interesting - where is the cabin air filter located?
 

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2021 K5 GT Line Wolf Gray w/Red Leather
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Interesting - where is the cabin air filter located?
Usually behind the glove box. Owners manual should say. The cabin filter filters ALL air that comes through your vents. Food smells, smoke smells etc. Currently there is no quality aftermarket filter offered but the dealer offers them for around $25.
 

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If you run your ac without turning it off and drying with just the fan for 2 minutes or so it could create a pissy smell. There are ways to spray some disinfectant from under the hood I’d assume and make sure it’s completely dry before breathing it in
 

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I don't know where you guys are and what your climate is, but for decades I've always kept my A/C in AUTO mode, with the compressor on. And I've never had stink problems. But if you do, just spray something like Lysol into the vents at the base of the windshield while the car's inside blower fan is runniing, to pull it through the inside vents. That should kill any bacteria or mold. You can also buy products specifically made for that at auto stores.
 
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