why does my Volvo XC60 Second Generation (2018-2024) AC smell musty when running

Volvo XC60 Second Generation (2018-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

552 words

Problem Statement

Learn how to diagnose and fix the musty smell from the AC in your Volvo XC60 (2018-2024). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

HVAC

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the engine is off and cool before performing any work in the cabin.

Symptoms

•Musty smell when the AC is running
•Reduced airflow from the vents
•Visible mold or mildew in the cabin air filter
•Water pooling under the vehicle when AC is on
•Frequent need to adjust temperature settings for comfort

Diagnostic Steps

1
Inspect the cabin air filter for dirt, debris, or mold.
2
Check the AC drain for blockages or restrictions.
3
Examine the evaporator core for signs of mold or moisture accumulation.
4
Test the operation of the AC system to ensure it is cycling properly.
5
Look for moisture leaks in the AC system components.

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

•Vacuum
•Soft brush
•Cleaning solution
•Gloves
•Flashlight

Parts Required

•Cabin air filter
•Antimicrobial cleaner (optional)

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Diagnostic Steps

1
Inspect the cabin air filter for dirt, debris, or mold.
2
Check the AC drain for blockages or restrictions.
3
Examine the evaporator core for signs of mold or moisture accumulation.
4
Test the operation of the AC system to ensure it is cycling properly.
5
Look for moisture leaks in the AC system components.

Solution

1. Preparation

Gather tools: vacuum, soft brush, cleaning solution, gloves, and a flashlight.
Ensure the vehicle is parked on a level surface and the engine is off.

2. Inspect and Replace Cabin Air Filter

Open the glove compartment and remove it to access the cabin air filter.
Remove the old cabin air filter by gently pulling it out.
Check the filter for mold or dirt; if dirty, replace it with a new one (ensure it is the correct part for your XC60).
Install the new cabin air filter by sliding it back into the housing.
Reattach the glove compartment.

3. Clean the Evaporator Core

Locate the access panel to the evaporator core (usually under the dashboard).
Attach a vacuum with a soft brush to remove dust and debris from the evaporator core.
Use a cleaning solution designed for HVAC systems and spray it onto the evaporator core to eliminate mold and mildew.
Allow the cleaning solution to sit for the recommended time before wiping any excess.

4. Clear the AC Drain

Locate the AC drain tube under the vehicle (typically on the passenger side).
Inspect the drain tube for blockages; use a flexible wire or compressed air to clear any obstructions.
Ensure that water can flow freely through the drain during operation.

5. Final Assembly and Testing

Reassemble any components removed during the cleaning process.
Start the vehicle and run the AC on high for about 15 minutes to help dry out the system and eliminate any remaining odors.
Monitor for any unusual smells or issues during the test.