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You probably have mildew growing in the A/C evaporator case. Hopefully, your car is under warranty. Take it back to the dealer. GM has factory-approved procedures to help remove the odors from the A/C evaporator case. It involves spraying an industrial grade disinfectant into the air intake for the HVAC system, then letting it do its work. Hopefully the disinfectant will kill the mold. If it doesn't, the parts from the HVAC will need to be removed and cleaned, or possibly replaced. This is very costly and time-consuming repair work, so get back the car back to the dealership as soon as possible and get it covered under warranty.

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Q: Why does your Chevy Impala have a really bad odor in the ventilation system when the air conditioner is running?
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