why does my Tesla Model S Plaid/Refresh (2021-present) AC smell bad when turned on

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

531 words

Problem Statement

Learn how to diagnose and fix bad smells from the AC in Tesla Model S Plaid. Step-by-step guide with symptoms, diagnostic steps, 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.
•Allow the vehicle to cool down before accessing the AC components.

Symptoms

•Foul or musty smell when AC is turned on
•Decreased cooling efficiency
•Presence of mold or mildew around AC vents
•Increased humidity in the cabin
•Unusual noises when AC is running

Diagnostic Steps

1
Inspect the cabin air filter for dirt, debris, or mold.
2
Check the evaporator core for signs of mold or contamination.
3
Examine the AC drain for blockages that may cause water accumulation.
4
Use an OBD-II scanner to check for any related error codes.
5
Inspect the AC system for any refrigerant leaks.

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

•Screwdrivers
•Vacuum cleaner
•Cleaning cloths
•Cabin air filter replacement
•Compressed air source

Parts Required

•Cabin air filter
•Evaporator core cleaner
•HVAC sanitizing spray

Related Faults

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Solution

1. Preparation

Gather tools: screwdrivers, vacuum cleaner, cleaning cloths, cabin air filter replacement.
Ensure the vehicle is parked on a level surface and the engine is off.

2. Cabin Air Filter Replacement

Open the front trunk and locate the cabin air filter compartment.
Remove any screws or fasteners securing the cover.
Gently pull out the old cabin air filter and inspect it for dirt or mold.
Vacuum the compartment to remove any debris.
Install the new cabin air filter, ensuring it is oriented correctly.
Re-secure the cover and fasteners.

3. Clean the Evaporator Core

Access the evaporator core by removing the dashboard if necessary (refer to the service manual).
Use a suitable cleaner (like an evaporator cleaner) and spray it onto the evaporator core.
Allow the cleaner to sit for the recommended time as per the product instructions.
Rinse with water if applicable, ensuring not to saturate electrical components.
Reassemble any removed components.

4. Clear AC Drain

Locate the AC drain hose underneath the vehicle.
Inspect for blockages; use compressed air to clear any obstructions.
Verify that water is draining freely when the AC is in operation.

5. System Sanitization

Use an HVAC sanitizing spray to treat the AC system.
With the AC running, spray the sanitizer into the air intake vents.
Allow the system to run for 10-15 minutes to circulate the sanitizing agent.