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The LTZ auto climate control pretty much does what it wants to control in-car humidity. It would not surprise me if it's running the AC in the winter and/or recirculate mode at times.
Posts by jblackburn
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The OP is right - generally keeping it in recirculate mildews it up much more quickly. Running fresh air on most cars and turning off the AC to dry out the core ~2-5 minutes before shutting down the car will help keep it from forming on a soggy evaporator core that's just sitting around without airflow.
There are cans of foamy stuff you can spray up the drain hose under the car to clean off the cores - I think I'll have to do it to both cars in the spring. They're both ~2 years old and both have a little funky smell on defrost.
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