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2021 Palisade Calligraphy AWD
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It' could be mold and mildew buildup on the A/C condenser. Keep in mind that when you run your A/C it produces a lot of moisture that you can normally see drain out the bottom of the car. If you run the A/C a lot and don't let it dry out completely then mold and mildew can grow. First start by changing out your air filter behind the glovebox with a good quality charcoal air filter. Second, whenever you run the A/C turn the heat on when you get about a mile from your destination so the system completely dries out and moisture doesn't sit in your system.
 

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It' could be mold and mildew buildup on the A/C condenser. Keep in mind that when you run your A/C it produces a lot of moisture that you can normally see drain out the bottom of the car. If you run the A/C a lot and don't let it dry out completely then mold and mildew can grow. First start by changing out your air filter behind the glovebox with a good quality charcoal air filter. Second, whenever you run the A/C turn the heat on when you get about a mile from your destination so the system completely dries out and moisture doesn't sit in your system.
Make sure that water is draining out when the AC is running--on a warm, humid day, park the car with the engine on and AC on and see if a puddle of water is formed under the car.

Also if you use "recirc" when AC running it produces less moisture and thus reduces the chance of mold/mildew from forming--this has worked for me with another car.

You can get a product like Frigi-fresh--it is designed to eliminate mold/mildew in car vent systems.
 
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