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It can be caused by condensation on the evaporator core and mold. Some times you can put some deodorant in the fresh air duct, but if it gets real bad, the dealer has some stuff they can spray on the evaporator core, but it isn't cheap. If the odor is fishy smelling it is probably caused by a LEAK in your HEATER CORE.

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โˆ™ 2006-11-22 09:51:21
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Q: What would cause a bad odor from the AC on a 1998 Ford Expedition?
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