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Special Report: Is Your Car Making You Sick?

Updated January 2025

Mold Can Be Spread Through Air Conditioning
From NBC 10 Consumer Reporter Tracy Davidson (nbc10.com)

John Consalvi and Jeanette Hallak both told NBC 10’s Consumer Alert Team that their cars’ heating and cooling systems are making them sick.

“We went to turn on the [air conditioning] one day, and it had a horrible smell – I call it a toxic smell,” Hallak said. “You immediately have to shut it off. I do have allergies [and] this probably made it worse.”

“I get a little dizzy whenever I smell the odor from the [air conditioning] unit. I’m allergic to mold and mildew, so I have to roll down the windows so I can feel better,” Consalvi said.

Experts call it “toxic car syndrome.”

“A lot of new vehicles have mold in the air conditioning system,” said Clarence Ditlow, with the Center for Auto Safety in Washington.

Ditlow said that mold in ventilation systems is a common problem.

“It results in water accumulating in it, promoting the growth of the mold, and whenever you turn on the air conditioner, the first thing you do is get hit with a blast of moldy air,” Ditlow said.

The challenge for car owners is how to fix the problem. Some car manufacturers have put out advisories on the problem and have told mechanics how to fix the problem. Many times it involves a disinfectant sprayed into the ventilation system.

The fix can cost you a few hundred dollars, and it doesn’t guarantee the moldy smell is gone for good.

“They sprayed it and installed the part, per the bulletin, and the odor was still there. I brought it back three times,” Consalvi said.

“What will happen, is that when you dump the chemicals into the (air conditioning) system, you will kill off the bacteria and the mold for awhile, but it will come back again,” Ditlow said.

Ditlow said that if a car has the problem, you are stuck with it for the life of the car.

Attorney Jacqueline Herritt has advice for consumers:

“If they turn it on and they smell any odd smell, they should definitely take it back into the dealership. Don’t settle for any excuses from the dealership – make sure something is done or it could affect your health,” Herritt said.

The Consumer Alert bottom line is, if you have a smell, you should complain to the manufacturer in writing and use the Lemon Law in your state to try to get the manufacturer to buy your car back.

Both Consalvi and Jeanette Hallak filed lawsuits against the manufacturer. They both have General Motors cars. General Motors has since bought back Consalvi’s car. He got a new truck from the company. Hallak settled with the company.

Can Mold Occur in Vehicle AC Ducts?

Yes, mold can develop in your vehicle’s air conditioning (AC) system, especially in areas with high humidity. The AC system’s evaporator collects moisture during operation, creating a damp environment that is ideal for mold growth. Over time, dust, pollen, and organic matter can accumulate in the ducts, providing further nourishment for mold spores.

Vehicles that are parked outside in humid or rainy climates are particularly vulnerable. Poorly maintained air conditioning systems or clogged cabin air filters can also increase the risk of mold development.

How Can You Tell if Mold Is Present in Your Vehicle’s AC?

There are several signs that mold might be growing in your car’s AC system:

1. Musty Odor: A persistent, musty smell when you turn on the AC is one of the most common indicators of mold.
2. Allergy Symptoms: If you or your passengers experience sneezing, coughing, itchy eyes, or other allergy-like symptoms while in the vehicle, mold could be the culprit.
3. Visible Mold: In some cases, you might notice mold growth on the vents or inside the ducts.
4. Reduced Airflow: Mold buildup can obstruct airflow, causing the AC system to work less effectively.

If you suspect mold but aren’t sure, a professional inspection can confirm its presence.

Why Is Mold in Your Vehicle’s AC Dangerous?

Mold in your car’s AC isn’t just unpleasant; it can pose serious health risks:

1. Respiratory Issues: Breathing in mold spores can irritate the lungs and exacerbate conditions like asthma or chronic bronchitis.
2. Allergic Reactions: Mold exposure can trigger symptoms such as sneezing, nasal congestion, skin irritation, and watery eyes.
3. Toxic Mold Risks: Certain types of mold, like black mold, can produce mycotoxins, which are harmful when inhaled over extended periods.
4. Worsened Air Quality: Mold growth can degrade the overall air quality inside your vehicle, making every drive uncomfortable and potentially hazardous.

What Should You Do if Mold Is Found in Your Vehicle’s AC?

If you discover mold in your car’s AC system, take immediate steps to address the issue:

1. Replace the Cabin Air Filter: A clogged or dirty filter can trap moisture and mold spores. Replacing it is a simple but effective first step.
2. Clean the Vents and Ducts: Use a specialized cleaner designed for automotive HVAC systems to eliminate mold from the ducts. Professional services may offer more thorough cleaning.
3. Use an Anti-Microbial Treatment: After cleaning, apply an anti-microbial spray to prevent mold from returning.
4. Run the AC Regularly: Frequent use of your AC system can help keep moisture levels in check. Use the recirculation setting sparingly to avoid trapping humid air inside the system.
5. Park in a Dry Location: Whenever possible, park your vehicle in a garage or under cover to reduce exposure to rain and humidity.
6. Seek Professional Help: If the mold problem persists, consult a professional HVAC technician or auto detailer for advanced cleaning and mold remediation.

Preventing Mold in the Future

To avoid mold issues in the future, adopt these habits:

• Keep the Interior Dry: Avoid leaving wet or damp items inside the vehicle.
• Ventilate Your Car: After running the AC, open the windows for a few minutes to let moisture escape.
• Regular Maintenance: Schedule regular inspections of your AC system and replace the cabin air filter as recommended by your vehicle’s manufacturer.
• Use a Dehumidifier: In especially humid climates, a portable dehumidifier can help reduce overall moisture inside your vehicle.

By staying vigilant and proactive, you can prevent mold from taking hold in your vehicle’s air conditioning system, ensuring a healthier and more comfortable driving experience.