my Tesla Model S Original (2012-2020) has an AC compressor that won’t turn on, what should I check?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

513 words

Problem Statement

Learn how to diagnose and fix the AC compressor not turning on in Tesla Model S (2012-2020). 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 high-voltage battery before working on the electrical system.
•Wear safety glasses and gloves when handling refrigerants.

Symptoms

•AC compressor not engaging
•Warm air blowing from the vents
•No unusual noises from the compressor
•Dashboard AC indicator light off or flashing
•Possible increased cabin humidity

Diagnostic Steps

1
Check the AC system for error codes using an OBD-II scanner.
2
Inspect the refrigerant levels to ensure they are within the manufacturer's specifications.
3
Verify the AC control settings on the touchscreen to ensure the system is properly configured.
4
Test the AC compressor relay for continuity.
5
Check for electrical issues, including blown fuses or faulty wiring to the compressor.
6
Inspect the cabin temperature sensor for functionality.

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
•Refrigerant gauge
•Multimeter
•Socket set
•Torque wrench

Parts Required

•AC compressor relay (if faulty)
•AC compressor (if faulty)
•Refrigerant (if levels are low)

Related Faults

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Diagnostic Steps

1
Check the AC system for error codes using an OBD-II scanner.
2
Inspect the refrigerant levels to ensure they are within the manufacturer's specifications.
3
Verify the AC control settings on the touchscreen to ensure the system is properly configured.
4
Test the AC compressor relay for continuity.
5
Check for electrical issues, including blown fuses or faulty wiring to the compressor.
6
Inspect the cabin temperature sensor for functionality.

Solution

1. Preparation

Ensure the vehicle is in a safe and flat location.
Disconnect the high-voltage battery to ensure safety while working on the AC system.
Gather necessary tools and replacement parts.

2. Check Refrigerant Levels

Locate the service ports on the AC system.
Attach a refrigerant gauge to the high and low-pressure ports.
Assess the pressure readings; if low, consider a refrigerant recharge.

3. Test AC Compressor Relay

Locate the AC compressor relay in the fuse box.
Remove the relay and inspect for corrosion or damage.
Use a multimeter to test for continuity; replace if faulty.

4. Inspect Electrical Connections

Visually inspect wiring and connectors leading to the AC compressor for damage or corrosion.
Use a multimeter to check for proper voltage at the compressor connector while the AC is activated.

5. Replace Faulty Components

If the relay or compressor is faulty, replace it:
- For the relay, simply replace it with a new one of the same specification.
- For the compressor, follow these sub-steps:
  1. Remove the drive belt by loosening the tensioner.
  2. Disconnect the electrical connector from the compressor.
  3. Unscrew the compressor mounting bolts and remove it from the engine bay.
  4. Install the new compressor, ensuring proper alignment and torque to manufacturer specifications.
  5. Reconnect the electrical connector and reattach the drive belt.