why is my Volvo XC60 making a musty smell when I turn on the AC

Volvo XC60 Second Generation (2018-2024)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

488 words

Problem Statement

Learn how to diagnose and fix the musty smell in the AC system of your Volvo XC60. 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

•Disconnect the battery before working on electrical components.
•Allow the vehicle to cool down before starting any work on the HVAC system.

Symptoms

•Musty or moldy odor while the AC is running
•Reduced airflow from the vents
•Foggy windows when the AC is on
•Water accumulation under the vehicle
•Occasional air conditioning system failures

Diagnostic Steps

1
Inspect the cabin air filter for dirt and mold.
2
Check for any visible leaks in the AC system.
3
Examine the AC drain tube for clogs or blockages.
4
Look for signs of mold or mildew growth on the evaporator core.
5
Use an OBD-II scanner to check for any related error codes.
6
Test the operation of the AC system at different settings.

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

•Screwdriver set
•Compressed air or wire
•AC cleaner spray
•Cloth for cleaning

Parts Required

•Cabin air filter
•AC cleaner (if needed)

Related Faults

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Diagnostic Steps

1
Inspect the cabin air filter for dirt and mold.
2
Check for any visible leaks in the AC system.
3
Examine the AC drain tube for clogs or blockages.
4
Look for signs of mold or mildew growth on the evaporator core.
5
Use an OBD-II scanner to check for any related error codes.
6
Test the operation of the AC system at different settings.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety while working on electrical components.

2. Replace Cabin Air Filter

Locate the cabin air filter housing, usually found behind the glove compartment.
Remove the glove compartment by unscrewing any screws and detaching it from the vehicle.
Take out the old cabin air filter, noting its orientation.
Install a new, high-quality cabin air filter (refer to owner’s manual for specifications).

3. Clear AC Drain Tube

Locate the AC drain tube, typically found under the vehicle near the firewall.
Use compressed air or a thin wire to clear any obstructions in the drain tube.
Ensure that any debris is removed and check for proper drainage.

4. Clean Evaporator Core

Access the evaporator core by removing the dashboard or HVAC housing if necessary.
Spray a specialized AC cleaner or a mixture of water and vinegar onto the evaporator core to eliminate mold and mildew.
Allow the cleaner to sit for the recommended time before wiping clean with a cloth.

5. Reassemble and Test

Reattach any components removed during the process (glove compartment, dashboard).
Reconnect the battery.
Start the vehicle and turn on the AC system to test for odors.