Ram 1500 recurring A/C odor issue despite cabin filter change and dealer treatment on Ram 1500

Some Ram 1500 owners report experiencing recurring A/C odor issues even after changing the cabin filter and seeking dealer treatment. Common causes for these unpleasant smells include a dirty cabin air filter, moldy evaporator coil, clogged condensate drain, and mold growth in the air ducts. In rare instances, a rodent infestation may also contribute to the odor. Owners are advised to check the A/C drain tube for proper function, as blockages can exacerbate the problem. Additionally, some have found that an A/C anti-bacterial treatment can help eliminate the bacteria causing the odor. If the musty smell persists post-filter change, using an ozone machine may be necessary. A sweet smell could indicate leaking coolant or refrigerant, which requires inspection and repair. To mitigate odors, it is recommended to turn off the A/C shortly before reaching a destination and to experiment with A/C settings, such as switching off the A/C when using the heat. Overall, addressing these issues may involve a combination of maintenance, treatments, and repairs to ensure a fresh-smelling interior in the Ram 1500.