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Home/Cars/Honda/Pilot/Third Generation (2016-present)/why does my Honda Pilot make a strange smell when I turn on the AC

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

Honda Pilot Third Generation (2016-present)

Severity: mediumDifficulty: medium1-2 hours
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.

Component
HVAC
Repair Time
1-2 hours

Safety Warnings

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

Solution

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

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

3. Clean the AC Evaporator

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

4. Inspect and Fix Coolant Leaks

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

5. Clear AC Drain Line

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

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

Additional Information

Component

HVAC

Repair Time

1-2 hours

Difficulty

medium

Severity

medium

Tools

5 items

Parts

2 items

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