Posted on 4/25/2025
That unpleasant smell that hits you when you switch on the AC isn’t just a nuisance—it usually means something’s growing or collecting where it shouldn’t. In many cases, the culprit is a buildup of moisture, debris, or bacteria inside your HVAC system. The cabin radiator—often referred to as the heater core or evaporator—can become a hotspot for mold and mildew if it isn’t draining or drying properly. If air starts smelling musty or sour, it could be a sign that this component needs cleaning or inspection. So, how do you know if your heater core or evaporator is causing the stink—and what’s the best way to clear the air? The Cabin Radiator and Its Role The cabin radiator, or more accurately, the evaporator core, is a small, finned coil located deep within your dashboard. It’s the part of the air conditioning system where cold air is generated. As warm cabin air passes over the cold evaporator coil, moi ... read more