Parts involved

Air intake
Where outside air enters the HVAC, usually at the cowl below the windshield.
Cabin filter housing
The compartment holding the cabin filter, often behind the glovebox.
Blower motor
The fan that pushes air through the vents; nests can block or damage it.

Signs of a nest

Cleaning it safely

  1. Protect yourself

    Wear gloves and a well-fitted mask; mouse droppings can carry hantavirus.

  2. Ventilate

    Open doors and the hood for half an hour before starting.

  3. Wet it down

    Spray droppings and nest material with a disinfectant and let it sit; never sweep or vacuum it dry.

  4. Remove and bag

    Remove the filter and nest material, double-bag them, and wipe the housing.

  5. Install a new filter

    Then run the fan with doors open and check for any remaining smell.

Keeping them out

Cars parked for days, especially near fields, open land or dumpsters, are most at risk in fall. Driving regularly, keeping food out of the car, parking in a closed garage and checking under the hood after the car sits all help. If wiring has been chewed, have a mechanic check it before driving; damaged wires can cause faults or fires. Parking in a closed garage, sealing gaps under the door and storing birdseed, grass seed and any other food in sealed bins away from the car all reduce the attraction. Checking the cabin filter each fall, before cold weather drives mice indoors, is the easiest early warning. A filter with shredded material or droppings tells you to look further before a nest grows into a bigger smell and repair problem.

Common questions

Should I use poison bait in my car?

No. A poisoned mouse may die in the vents or dash, where it is much harder to reach. Traps and exclusion are better.

Can mice damage the HVAC system?

Yes. Nests can block airflow, and chewed wires or blower parts may need repair.

Are rodent deterrents effective?

Results vary. Removing food, driving regularly and sealing garage gaps usually work better than sprays or devices alone.

General information for Aurora, not a quote or professional advice. In an emergency, call 911.