my Volvo XC90 makes a burning smell when I turn on the AC, what’s wrong?

Volvo XC90 Second Generation (2015-2024)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

500 words

Problem Statement

Learn how to diagnose and fix the burning smell from AC in Volvo XC90. 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 systems.
•Allow the engine to cool before inspecting or working on the AC system.

Symptoms

•Burning smell when AC is turned on
•AC not blowing cold air
•Strange noises coming from the AC system
•Increased engine temperature
•Possible smoke or vapor from the AC vents

Diagnostic Steps

1
Inspect the AC compressor for signs of wear or damage.
2
Check the drive belt for fraying or excessive wear.
3
Look for refrigerant leaks around AC components.
4
Examine the cabin air filter for blockages or debris.
5
Test the electrical connections at the compressor for shorts or corrosion.

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
•Screwdrivers
•Multimeter
•Refrigerant leak detector
•Shop vacuum

Parts Required

•AC compressor (if damaged)
•Drive belt (if worn)
•Cabin air filter

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Solution

1. Preparation

Tools Required: Socket set, screwdrivers, multimeter, refrigerant leak detector, shop vacuum.
Safety Warnings: Disconnect the battery before working on electrical systems.

2. Inspect AC Compressor

Locate the AC compressor under the hood.
Visually inspect for any leaks, cracks, or damage.
Spin the compressor pulley by hand; it should turn smoothly without resistance.
If damaged, proceed to replace the compressor.

3. Check and Replace Drive Belt

Locate the drive belt connected to the AC compressor.
Inspect the belt for fraying, cracks, or excessive wear.
If the belt is damaged, remove it by loosening the tensioner pulley.
Install a new drive belt, ensuring proper routing and tension.

4. Examine Electrical Connections

Inspect the electrical connections at the AC compressor.
Use a multimeter to check for continuity and voltage at the connector.
Clean any corrosion with electrical cleaner and reconnect.
Replace connectors if damaged.

5. Clean or Replace Cabin Air Filter

Locate the cabin air filter, usually behind the glove compartment.
Remove the glove compartment for access.
Inspect the filter for blockage and replace if necessary.
Clean the housing area with a shop vacuum before installing a new filter.