why does my Honda Pilot Third Generation (2016-present) have a musty smell when the AC is on

Honda Pilot Third Generation (2016-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

461 words

Problem Statement

Learn how to diagnose and fix the musty smell from the AC in Honda Pilot 2016-2023. 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 systems.
•Allow the engine to cool before accessing the AC components.

Symptoms

•Musty or moldy odor when the AC is operational
•Reduced airflow from the AC vents
•Water pooling under the vehicle
•Increased humidity inside the cabin
•Potentially fogging of windows

Diagnostic Steps

1
Inspect the cabin air filter for dirt or mold.
2
Check the AC drain tube for obstructions or clogs.
3
Examine the AC evaporator coil for signs of mold or mildew.
4
Listen for unusual noises from the AC compressor, indicating possible issues.
5
Scan for any related error codes using an OBD-II scanner.

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

•Socket set
•Torx screwdriver
•Vacuum cleaner
•OBD-II scanner
•Compressed air

Parts Required

•Cabin air filter
•AC coil cleaner

Related Faults

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Solution

1. Preparation

Gather tools: socket set, torx screwdriver, vacuum cleaner, and an OBD-II scanner.
Ensure the vehicle is parked on a level surface and the engine is off.

2. Replace Cabin Air Filter

Locate the cabin air filter housing, typically behind the glove box.
Remove the glove box by disengaging the stop arm and any screws.
Take out the old cabin air filter and inspect for dirt or mold.
Install the new cabin air filter, ensuring it is oriented correctly.

3. Clean the AC Evaporator Coil

Access the evaporator coil via the dashboard (may require removing additional panels).
Use a vacuum to remove any debris from the coil.
Apply an AC coil cleaner and let it sit for the recommended time.
Rinse if the cleaner requires it and allow the evaporator to dry.

4. Clear AC Drain Tube

Locate the AC drain tube, usually found under the vehicle near the firewall.
Use compressed air or a flexible cleaning brush to clear any blockages.
Ensure that water can freely drain from the AC system.

5. Final Checks

Reassemble any components removed during the process.
Start the vehicle and run the AC on high for a few minutes to circulate air.