my Honda Pilot makes a burning smell when I turn on the AC what could it be

Honda Pilot YF3 (2016-2022)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

504 words

Problem Statement

Learn how to diagnose and fix the burning smell from AC in Honda Pilot. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Wear gloves and safety goggles when handling refrigerant.

Symptoms

•Burning smell when AC is turned on
•Reduced cooling performance from the AC
•Unusual noises from the AC compressor or blower motor
•Possible overheating of the engine
•Increased humidity inside the vehicle

Diagnostic Steps

1
Inspect the AC compressor for signs of overheating or damage.
2
Check the serpentine belt for fraying or wear.
3
Examine the AC condenser for debris or blockage.
4
Use an OBD-II scanner to check for any related error codes.
5
Inspect the cabin air filter for clogs or contamination.
6
Check the refrigerant level and condition.

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

•OBD-II scanner
•Socket set
•Torque wrench
•Refrigerant gauge set
•Screwdrivers

Parts Required

•AC compressor (if required)
•Serpentine belt (if required)
•Cabin air filter (if required)
•Refrigerant (as needed)

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Diagnostic Steps

1
Inspect the AC compressor for signs of overheating or damage.
2
Check the serpentine belt for fraying or wear.
3
Examine the AC condenser for debris or blockage.
4
Use an OBD-II scanner to check for any related error codes.
5
Inspect the cabin air filter for clogs or contamination.
6
Check the refrigerant level and condition.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface.
Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace the AC Compressor

Sub-steps:
- Remove the drive belt by loosening the tensioner pulley with a socket wrench.
- Disconnect electrical connectors from the AC compressor.
- Unbolt the compressor from its mounting using a socket set.
- Remove the compressor from the engine bay.
- Install the new compressor by reversing the removal steps, ensuring all connections are secure.

3. Check and Replace the Serpentine Belt

Sub-steps:
- Inspect the belt for signs of wear, fraying, or burning.
- If damaged, remove the old belt and install a new one by following the routing diagram usually found near the engine bay.
- Use a torque wrench to ensure the tensioner is properly adjusted.

4. Clean or Replace the Cabin Air Filter

Sub-steps:
- Locate the cabin air filter (usually behind the glove compartment).
- Remove the filter cover and take out the old filter.
- Clean the housing and install a new cabin air filter.

5. Refill Refrigerant (if necessary)

Sub-steps:
- Attach a refrigerant gauge set to the AC service ports.
- Check the refrigerant levels and add refrigerant as specified by the manufacturer.
- Ensure there are no leaks before sealing the ports.