how to fix the AC not working in my Tesla Model S Original (2012-2020)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

581 words

Problem Statement

Learn how to diagnose and fix AC not working in Tesla Model S (2012-2020). 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 high-voltage battery before working on the AC system.
•Wear gloves and eye protection when handling refrigerant.

Symptoms

•AC not blowing cold air
•Unusual noises from the AC compressor
•AC system not engaging when set to cool
•Service AC warning displayed on the dashboard
•Reduced airflow from AC vents

Diagnostic Steps

1
Check the AC settings on the touchscreen to ensure it is set to 'cool' and the temperature is set appropriately.
2
Inspect the cabin air filter for clogs or blockages that may restrict airflow.
3
Use an OBD-II scanner to check for any error codes related to the AC system.
4
Verify the refrigerant levels to ensure the system is properly charged.
5
Inspect the AC compressor for any visible damage or leaks.
6
Test the AC relay and associated fuses for continuity.

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
•Screwdriver
•Socket set
•Refrigerant gauge set
•Torque wrench
•Gloves

Parts Required

•Cabin air filter
•Refrigerant (as specified by manufacturer)
•AC compressor (if needed)

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Diagnostic Steps

1
Check the AC settings on the touchscreen to ensure it is set to 'cool' and the temperature is set appropriately.
2
Inspect the cabin air filter for clogs or blockages that may restrict airflow.
3
Use an OBD-II scanner to check for any error codes related to the AC system.
4
Verify the refrigerant levels to ensure the system is properly charged.
5
Inspect the AC compressor for any visible damage or leaks.
6
Test the AC relay and associated fuses for continuity.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the ignition is off.
Disconnect the high-voltage battery for safety.

2. Replace Cabin Air Filter

Tools Required: Screwdriver, new cabin air filter
Sub-steps:
1. Open the front trunk (frunk) and remove the plastic cover to access the cabin air filter.
2. Unscrew the filter housing cover and carefully remove the old filter.
3. Install the new cabin air filter, ensuring the airflow direction matches the markings.
4. Reattach the filter housing cover and plastic cover.

3. Recharge Refrigerant

Tools Required: Refrigerant gauge set, refrigerant (as specified by manufacturer), gloves
Sub-steps:
1. Connect the refrigerant gauge set to the low-pressure service port.
2. Start the vehicle and turn the AC to maximum cool.
3. Check the pressure readings; if low, add refrigerant until the system reaches the specified pressure according to the manufacturer’s specifications.
4. Disconnect the gauge set and ensure there are no leaks.

4. Inspect/Replace AC Compressor

Tools Required: Socket set, torque wrench, replacement AC compressor (if needed)
Sub-steps:
1. Locate the AC compressor in the engine compartment.
2. Disconnect the wiring harness and refrigerant lines from the compressor.
3. Remove the mounting bolts and carefully take out the compressor.
4. Install the new compressor, ensuring proper alignment and torque specifications on the mounting bolts.
5. Reconnect the refrigerant lines and wiring harness.

5. Test the AC System

Tools Required: None
Sub-steps:
1. Reconnect the high-voltage battery.
2. Start the vehicle and set the AC to the cooling mode.
3. Monitor for any unusual noises and check if the AC is blowing cold air.