why is my Tesla Model S Plaid/Refresh (2021-present) making a musty smell when I turn on the AC?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

507 words

Problem Statement

Learn how to diagnose and fix the musty smell when AC is activated in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures 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 vehicle to cool before accessing internal components.

Symptoms

•Musty or moldy odor when the AC is turned on
•Increased humidity inside the cabin
•Unpleasant smell persists regardless of temperature settings
•Possible reduced airflow from the vents
•Occasional fogging of windows

Diagnostic Steps

1
Inspect the cabin air filter for dirt, mold, or debris.
2
Check for water accumulation in the AC drain tube or under the vehicle.
3
Examine the AC evaporator for signs of mold or mildew.
4
Scan for any related error codes using the Tesla diagnostics system.
5
Evaluate the condition of the HVAC system through visual inspection.

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

•Screwdriver set
•Trim removal tool
•Evaporator cleaner spray
•Soft cloth or rags
•Flexible brush
•Compressed air

Parts Required

•Cabin air filter
•Evaporator cleaner

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Diagnostic Steps

1
Inspect the cabin air filter for dirt, mold, or debris.
2
Check for water accumulation in the AC drain tube or under the vehicle.
3
Examine the AC evaporator for signs of mold or mildew.
4
Scan for any related error codes using the Tesla diagnostics system.
5
Evaluate the condition of the HVAC system through visual inspection.

Solution

1. Preparation

Gather necessary tools and materials.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the 12V battery for safety.

2. Cabin Air Filter Replacement

Sub-steps:
1. Open the frunk and locate the cabin air filter housing.
2. Release the clips or screws securing the cover and remove it.
3. Carefully pull out the old cabin air filter.
4. Inspect the filter slot for debris and clean if necessary.
5. Install the new cabin air filter (ensure proper orientation).
6. Reattach the cover and secure it with clips or screws.

Tools Required:

Screwdriver set
Trim removal tool (if applicable)

3. Clean the AC Evaporator

Sub-steps:
1. Access the AC evaporator by removing the dashboard cover (if required).
2. Use an evaporator cleaner spray to disinfect the evaporator core.
3. Allow the cleaner to sit for the time specified on the product label.
4. Wipe down any accessible areas to remove residual moisture.
5. Reassemble the dashboard cover securely.

Tools Required:

Evaporator cleaner spray
Soft cloth or rags

4. Clear AC Drain Tube

Sub-steps:
1. Locate the AC drain tube underneath the vehicle (typically on the passenger side).
2. Inspect for any blockages; use a flexible brush or compressed air to clear debris.
3. Ensure that water can drain freely from the tube.

Tools Required:

Flexible brush
Compressed air (optional)