my Skoda Octavia NFL (2020-Present) has a persistent fog on the windows

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery.
• Ensure the vehicle is parked on a flat, level surface.

2. Replace Cabin Air Filter

• Sub-steps:
  1. Locate the cabin air filter housing (usually behind the glove box).
  2. Remove the glove box to access the filter compartment.
  3. Remove the old cabin air filter; note the direction of airflow.
  4. Install the new cabin air filter, ensuring it is oriented correctly.
  5. Reassemble the glove box.

3. Inspect and Repair HVAC System

• Sub-steps:
  1. Remove the dashboard panel to access the HVAC blower motor and ducts.
  2. Inspect the blower motor for proper operation and any obstructions.
  3. Check all heater core connections for leaks.
  4. If necessary, replace the blower motor or heater core.

4. Check Seals and Insulation

• Sub-steps:
  1. Inspect door seals and window seals for wear or damage.
  2. Replace any damaged seals to prevent moisture ingress.
  3. Check the firewall for any gaps or openings that could allow moisture.

5. Test and Clean A/C System

• Sub-steps:
  1. Use a multimeter to ensure the A/C compressor is functioning correctly.
  2. If malfunctioning, replace the A/C compressor or associated sensors.
  3. Clean the A/C evaporator if mold or mildew is present.

Tools Required:

• Socket set
• Screwdrivers
• Multimeter
• Replacement cabin air filter
• HVAC system cleaning spray (if needed)

Parts Required:

• Cabin air filter
• Any damaged seals or components found during inspection
• A/C compressor (if necessary)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect battery before working on electrical systems.
• Ensure the engine is cool before performing any repairs on the HVAC system.