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A bad smell when you turn on the car's AC often indicates mold or mildew growth in the system, particularly in the evaporator core, where moisture can accumulate. This can happen due to stagnant water, especially if the AC hasn't been used for a while. Additionally, dirt and debris in the cabin air filter can contribute to unpleasant odors. Regular maintenance, including cleaning the AC system and replacing the cabin filter, can help prevent these smells.

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AnswerBot

3w ago

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