why does my Volkswagen Golf Eighth Generation (2020-present) air conditioning smell like mildew

Volkswagen Golf Eighth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

566 words

Problem Statement

Learn how to diagnose and fix mildew smell in A/C system of Volkswagen Golf Eighth Generation. Step-by-step guide with symptoms and solutions.

Affected Component

HVAC

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to prevent shorts.

Symptoms

•Foul mildew smell when the air conditioning is turned on
•Reduced airflow from the vents
•Increased humidity levels inside the vehicle
•Possible presence of water pooling under the dashboard
•Occasional fogging of windows when the A/C is activated

Diagnostic Steps

1
Inspect the cabin air filter for dirt or mold buildup.
2
Check the A/C drain tube for blockages or leaks.
3
Examine the evaporator core for signs of mold or mildew growth.
4
Use an OBD-II scanner to check for any related trouble codes.
5
Verify the operation of the A/C system under various settings (recirculation vs. fresh air).

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Flathead screwdriver
•Socket set
•A/C cleaning spray or foaming cleaner

Parts Required

•New cabin air filter
•A/C cleaning spray or foaming cleaner

Related Faults

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Diagnostic Steps

1
Inspect the cabin air filter for dirt or mold buildup.
2
Check the A/C drain tube for blockages or leaks.
3
Examine the evaporator core for signs of mold or mildew growth.
4
Use an OBD-II scanner to check for any related trouble codes.
5
Verify the operation of the A/C system under various settings (recirculation vs. fresh air).

Solution

1. Preparation

Gather tools and materials:
- Flathead screwdriver
- Socket set
- A/C cleaning spray or foaming cleaner
- New cabin air filter (if needed)
Disconnect the vehicle battery for safety before starting work.

2. Remove Cabin Air Filter

Locate the cabin air filter housing, typically found behind the glove compartment.
Open the glove compartment and remove any contents.
Use a flathead screwdriver to gently pry the stops on either side of the compartment to allow it to drop down.
Remove the cabin air filter cover by unscrewing or unclipping it.
Take out the old cabin air filter and inspect it for mold or dirt.

3. Clean the Evaporator Core

Access the evaporator core by removing the cover, typically located near the cabin air filter.
Spray the A/C cleaning solution directly onto the evaporator core.
Allow the solution to penetrate for the time specified in the product instructions, typically 10-15 minutes.
Wipe any excess cleaner away with a clean cloth.

4. Clear the A/C Drain Tube

Locate the A/C drain tube, usually found under the vehicle near the firewall.
Inspect the drain tube for blockages like dirt or debris.
If blocked, use a flexible tool to clear the obstruction or gently push compressed air through the tube.
Ensure that the drain is free-flowing.

5. Install New Cabin Air Filter

If the old cabin air filter was dirty or moldy, replace it with a new one.
Reassemble the cabin air filter housing and glove compartment.
Reconnect the battery.