Last summer I noticed a musty smell every time I turned the AC on. Thought it was just leftover moisture or maybe something in the vents. A few days later my wife started sneezing every time we got in the car. That’s when I realized it wasn’t just about comfort – that smell could mean mold or bacteria in the system. We ended up having the evaporator cleaned and the drainage line unclogged. The difference was immediate – no more smell, and the air actually felt fresher. If you’re getting a sweet or chemical smell, that could even mean a refrigerant leak. These aren’t just annoyances – they’re signs something’s wrong inside. If you’re not sure what the smell means, this article gives a solid breakdown of what to look for: https://greenecodream.com/top-signs-your-vehicle-needs-immediate-car-ac-repair/  – it helped me catch the issue before it got worse.