why does my Honda Civic 9th Generation (2012-2015) AC smell musty

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety during inspection.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Replace Cabin Air Filter

• Tools Required: Flathead screwdriver, replacement cabin air filter
  • Open the glove compartment and remove any contents.
  • Locate the stops on both sides of the glove compartment and press them in to lower it.
  • Remove the cover for the cabin air filter by unscrewing any screws or clips.
  • Take out the old cabin air filter and inspect for dirt or mold.
  • Replace with a new cabin air filter, ensuring it is oriented correctly (check airflow direction).
  • Reattach the cover and the glove compartment.

3. Clean the Evaporator Core

• Tools Required: AC cleaner spray, soft brush or cloth
  • Access the evaporator core by removing the HVAC housing as per the service manual.
  • Use an AC cleaner spray to coat the evaporator core and allow it to sit for the recommended time.
  • Gently brush or wipe the evaporator core to remove any mold or debris.
  • Rinse with clean water if required by the cleaner manufacturer's instructions.

4. Clear the AC Drain Tube

• Tools Required: Compressed air or a flexible cleaning brush
  • Locate the AC drain tube under the vehicle.
  • Use compressed air to blow out any clogs or obstructions.
  • Check for proper drainage by running the AC system and observing for water flow.

5. Reassemble and Test

• Reassemble any components removed during access to the evaporator core and drain tube.
• Reconnect the battery.
• Start the vehicle and operate the AC system at maximum setting for 10-15 minutes.
• Verify that the musty smell has dissipated and that the system is functioning correctly.