why does my Toyota Camry XV70 (2018-2024) have a musty smell when using AC?

Toyota Camry XV80 (2025-Present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

473 words

Problem Statement

Learn how to diagnose and fix the musty smell in the AC system of your Toyota Camry XV70 (2018-2024). 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.

Symptoms

•Musty odor when AC is activated
•Decreased airflow from vents
•Possible condensation on interior surfaces
•Wet carpets or floor mats
•Increased humidity inside the cabin

Diagnostic Steps

1
Inspect the cabin air filter for dirt or mold.
2
Check for any visible signs of moisture in the AC evaporator case.
3
Examine the drain tube for blockages or leaks.
4
Test the AC system for proper operation and airflow.
5
Look for signs of mold or mildew on the AC 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

•Screwdriver set
•AC cleaner spray
•Compressed air or flexible cleaning brush

Parts Required

•New cabin air filter

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Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the negative battery terminal.

2. Replace Cabin Air Filter

Locate the cabin air filter housing, usually found behind the glove compartment.
Remove the glove compartment by unscrewing any fasteners and releasing the clips.
Take out the old cabin air filter; inspect for dirt and mold.
Insert a new cabin air filter, ensuring it is oriented correctly according to airflow arrows.
Reassemble the glove compartment.

3. Clean AC Evaporator

Access the AC evaporator by removing the HVAC cover (may require disassembling parts of the dashboard).
Use a specialized AC cleaner spray to clean the evaporator coils and kill any mold or mildew.
Allow the cleaner to sit for the recommended time as per product instructions.

4. Unclog Drain Tube

Locate the AC drain tube under the vehicle (usually on the passenger side).
Use compressed air or a flexible cleaning brush to clear any blockage in the drain tube.
Ensure that the tube is securely reattached after cleaning.

5. Final Assembly and Testing

Reassemble any removed components.
Reconnect the negative battery terminal.
Start the engine and turn on the AC system to test for improvement in smell and airflow.