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Old 01-13-2012, 11:02 PM
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LC Hauler LC Hauler is offline
Dodge Ram Forum Senior Member
Join Date: Dec 2011
Location: Calgary
Age: 39
Posts: 707
Gender: Male
Vehicle: 2014 Ram 2500 Laramie
Trim Level: Laramie
Color: Bright Metalic Grey
Engine: 2014-20?? 392ci (6.4L) Hemi V8 410hp 429lb/ft
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LC Hauler will become famous soon enough

that is the AC, I have noticed the same in my car when I run the defrost. My advice is to use the defrost every day when you drive the truck on high heat /low fan, and that will help get that mildewy smell away. Because technically the AC mixes with the heat when you use defrost that smells tends to produce some moisture in the ducting.

I note this more in my car as I park it for the winter, so I just run it for about 20 mins with the defrost on full hilt during the winter every month or so. Pretty much takes care of h mildew smell.
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