If your car smells like mildew or has foul smell when you turn on the air conditioning, then you could have fungus growth on the air conditioning (AC) component called the evaporator.

Your car's AC system has an evaporator that is located underneath the dashboard. It is usually hidden behind the passenger's glove compartment. The job of the evaporator is to remove hot and humid air and turn it into dry cool air.

The evaporator is enclosed in a dark box where moisture could still be present long after you've turned off the AC. Once the AC is turned off there won't be any circulated fresh air to dry off the evaporator. Overtime, the moisture that gets collected in the evaporator could be very problematic.

Th problem occurs when a dark and damp closed box condition persists over time. This dark and moist environment is a perfect place for smelly bacteria to grow. When the bacteria started to grow, you could only expect mildew or foul smell to blow through every time you turn on your AC.

What could make matter worse is if your evaporator system has a semi plugged drainage hose (which was designed to drained out the condensation created by the AC evaporator) water could leak into the interior of your car causing more trouble.

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