my Tesla Model S Plaid/Refresh (2021-present) has foggy windows when using AC

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

569 words

Problem Statement

Learn how to diagnose and fix foggy windows when using AC in Tesla Model S Plaid. Step-by-step guide with symptoms, diagnostic steps, and solutions.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the vehicle's 12V battery before working on electrical systems.
•Follow proper handling procedures when dealing with refrigerants.

Symptoms

•Foggy or misted windows when AC is running
•Insufficient cooling from the air conditioning system
•Unpleasant odors from the AC vents
•Moisture buildup in the cabin
•Increased humidity inside the vehicle

Diagnostic Steps

1
Inspect the cabin air filter for blockages or contamination.
2
Check the refrigerant level in the AC system using a manifold gauge.
3
Scan the vehicle for any HVAC-related error codes using Tesla's diagnostics.
4
Inspect the AC evaporator for signs of mold or mildew.
5
Verify the operation of the AC compressor and its clutch engagement.
6
Assess the drainage system for the AC evaporator to ensure proper moisture removal.

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

•Torx screwdriver
•AC manifold gauge
•Vacuum pump
•Compressed air
•Flashlight

Parts Required

•Cabin air filter
•Refrigerant (specific to Tesla Model S specifications)

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Diagnostic Steps

1
Inspect the cabin air filter for blockages or contamination.
2
Check the refrigerant level in the AC system using a manifold gauge.
3
Scan the vehicle for any HVAC-related error codes using Tesla's diagnostics.
4
Inspect the AC evaporator for signs of mold or mildew.
5
Verify the operation of the AC compressor and its clutch engagement.
6
Assess the drainage system for the AC evaporator to ensure proper moisture removal.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface.
Disconnect the vehicle's 12V battery for safety.

2. Cabin Air Filter Replacement

Tools Required: Torx screwdriver, new cabin air filter.
Remove the glove compartment by unscrewing the retaining screws.
Detach the glove compartment door to access the cabin air filter housing.
Remove the old cabin air filter and install the new one, ensuring proper orientation.
Reassemble the glove compartment.

3. AC System Service

Tools Required: AC manifold gauge, refrigerant (if needed), vacuum pump.
Connect the manifold gauge to the AC service ports.
Check the low and high-side pressures to determine if the system is undercharged or overcharged.
If low, evacuate the system using a vacuum pump for at least 30 minutes, then recharge with the appropriate type and amount of refrigerant.
If overcharged, release excess refrigerant until pressures are within specifications.

4. Evaporator Inspection and Cleaning

Tools Required: Access to the HVAC system, cleaning solution (if mold/mildew is present).
Remove the dashboard or access panel to reach the AC evaporator.
Inspect for signs of mold or mildew; clean with a suitable disinfectant if necessary.
Ensure the evaporator drain is clear; use compressed air to blow out any debris.

5. Drainage System Check

Tools Required: Flashlight, possibly a vacuum or compressed air.
Check the AC drain hose for blockages; clear any debris that may be obstructing the drainage.
Verify that the drainage system allows moisture to exit the vehicle effectively.