why does my Volvo XC90's air conditioning smell musty when turned on

Solution

1. Preparation

• Gather tools and materials: cabin air filter, cleaning solution, towels, vacuum, and protective gloves.
• Ensure the vehicle is parked on a level surface and the engine is off.

2. Replace Cabin Air Filter

• Sub-steps:
  1. Open the glove compartment and remove any contents.
  2. Locate the cabin air filter cover and unclip it.
  3. Remove the old cabin air filter and inspect for mold or dirt.
  4. Install the new cabin air filter, ensuring it is oriented correctly.
• Tools Required: None specifically, but a vacuum may help with debris.
• Safety Warnings: Ensure the vehicle is off to avoid accidental activation of the A/C system.

3. Clean the Evaporator Core

• Sub-steps:
  1. Access the evaporator core by removing the dashboard or using the service manual for guidance.
  2. Spray a cleaning solution designed for evaporator cores onto the core.
  3. Allow the solution to sit for the recommended time to kill mold and mildew.
  4. Wipe down any accessible surfaces with a clean towel.
• Tools Required: Cleaning solution, towels.
• Safety Warnings: Disconnect the battery before working on electrical components.

4. Clear A/C Drain Tube

• Sub-steps:
  1. Locate the A/C drain tube under the vehicle.
  2. Use a flexible brush or compressed air to clear any clogs.
  3. Ensure water drains freely after clearing the blockage.
• Tools Required: Flexible brush or compressed air.
• Safety Warnings: Ensure vehicle is stable if working underneath.