Air Conditioner

Check to see that a mouse has not built a nest in your air ducts or that debris (leaves and tree debris) has not accumulated around the air intake for the heating ventilation ducts at windscreen wiper area of the lower windscreen. Look for signs of a rodent nesting in the engine compartment. Try using a spray aerosol disinfectant (Lysol or the likes), spray it into the air ducts let it sit a few minutes, the start the engine spray it in the air intake while someone operates the heating knob to various settings. Perhaps pull out the cabin air filter see if it has trapped debris as well.