why does my Honda Pilot make a strange smell when I turn on the AC

Honda Pilot Third Generation (2016-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

528 words

Problem Statement

Learn how to diagnose and fix strange smells from the AC in your Honda Pilot. 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 cool before working on the AC system.
•Disconnect the battery if working on electrical components.

Symptoms

•Musty or moldy odor
•Burning smell
•Sweet, coolant-like odor
•Unpleasant chemical smell

Diagnostic Steps

1
Inspect the cabin air filter for dirt or mold buildup.
2
Check for any signs of coolant leaks around the engine compartment.
3
Examine the AC condenser and evaporator for signs of mold or debris.
4
Use an OBD-II scanner to check for any related error codes.
5
Inspect the AC drain line for blockages.

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

•Safety goggles
•Gloves
•Vacuum cleaner
•Screwdrivers (flathead and Phillips)
•Flexible wire or compressed air

Parts Required

•Cabin air filter
•AC cleaner or disinfectant

Related Faults

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Solution

1. Preparation

Gather tools and materials: safety goggles, gloves, vacuum cleaner, replacement cabin air filter, cleaning spray.
Ensure the engine is turned off and the AC system is off.

2. Replace Cabin Air Filter

Locate the cabin air filter compartment (usually behind the glove box).
Remove the glove box if necessary to access the filter.
Take out the old cabin air filter and inspect it for dirt and mold.
Clean the compartment with a vacuum or damp cloth.
Install the new cabin air filter according to the airflow direction indicated on the filter.

3. Clean the AC Evaporator

Mix a solution of water and a mild disinfectant or specialized AC cleaner.
Access the AC evaporator by removing the dashboard or vent cover (if applicable).
Spray the cleaning solution onto the evaporator coils while ensuring the area is well-ventilated.
Allow the cleaner to sit for a few minutes to disinfect and eliminate odors.
Rinse if required and let the evaporator dry before reassembling the dash.

4. Inspect and Fix Coolant Leaks

Visually inspect the engine bay for any signs of coolant leakage.
If coolant is leaking, identify the source (hoses, radiator, or heater core).
Replace any damaged hoses or components and refill the cooling system with the appropriate coolant type.

5. Clear AC Drain Line

Locate the AC drain line under the vehicle (usually a rubber tube).
Use a flexible wire or compressed air to clear any blockages.
Ensure that water drains freely when the AC is on.