What causes the smell
The evaporator gets cold and wet every time the AC runs. In humid North Texas springs, mold thrives there once the car is shut off.
How to fix it
- Replace the cabin air filter
- Apply evaporator cleaning foam through the drain or vents
- Clear a clogged condensate drain
- Run the fan without AC for 2 minutes before parking
Other smells
A sweet smell means coolant from the heater core. A burning smell may be the blower motor.