Buick Envision persistent musty smell upon startup despite evaporator replacement on Buick Envision

Some Buick Envision owners report experiencing a persistent musty smell in their vehicle's AC system even after replacing the evaporator. This issue may stem from a dirty or clogged cabin air filter, which can lead to mold and bacteria growth, causing unpleasant odors. Additionally, neglecting to clean the evaporator coil can result in mold or mildew buildup, further contributing to the musty smell. Some owners find it beneficial to seek professional service for a thorough cleaning of the evaporator and other AC components to eliminate lingering odors. Using a specialized AC disinfectant while the system runs can also help kill mold and bacteria in the air intake. Furthermore, some owners discover that coolant leaks, which may present a sweet, syrupy smell, require prompt repair to prevent further complications. Regular maintenance, including replacing or cleaning the cabin air filter, is essential to prevent dirt and bacteria buildup that leads to foul odors.