how to troubleshoot Tesla Model S Original (2012-2020) AC not blowing cold air

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

619 words

Problem Statement

Learn how to troubleshoot and fix AC not blowing cold air in Tesla Model S (2012-2020). Step-by-step guide with 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 systems.
•Use caution when handling refrigerants; they can be harmful if inhaled or improperly handled.

Symptoms

•AC system emits warm air instead of cold
•Increased cabin humidity
•Strange noises from the AC compressor area
•AC compressor does not engage
•Warning message or alert on the dashboard related to the AC system

Diagnostic Steps

1
Check the climate control settings to ensure the AC is activated and set to a low temperature.
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 HVAC system.
4
Inspect the AC compressor for signs of damage or leaks.
5
Verify the refrigerant level using a manifold gauge set.
6
Check electrical connections to the AC compressor and associated relays for continuity and proper function.

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

•Manifold gauge set
•Socket set
•Screwdrivers
•Belt tensioner tool
•Safety glasses

Parts Required

•Cabin air filter
•Refrigerant (R-134a or R-1234yf, depending on model)
•AC compressor (if found defective)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the climate control settings to ensure the AC is activated and set to a low temperature.
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 HVAC system.
4
Inspect the AC compressor for signs of damage or leaks.
5
Verify the refrigerant level using a manifold gauge set.
6
Check electrical connections to the AC compressor and associated relays for continuity and proper function.

Solution

1. Preparation

Ensure the vehicle is parked on a level surface and turned off.
Disconnect the negative terminal of the battery to prevent electrical shock.
Gather tools: manifold gauge set, socket set, screwdrivers, and safety glasses.

2. Replace Cabin Air Filter

Locate the cabin air filter access panel, typically found behind the glove compartment.
Open the glove compartment and remove any screws holding the access panel.
Carefully pull out the old cabin air filter and inspect it for dirt and clogs.
Install a new cabin air filter, ensuring it is oriented correctly.

3. Recharge Refrigerant

Connect the manifold gauge set to the high and low pressure ports on the AC system.
Check the pressure readings to determine if the refrigerant is low.
If low, follow these sub-steps:
- Attach the refrigerant can to the low-pressure side of the manifold gauge set.
- Open the valve on the refrigerant can and allow the refrigerant to flow into the system until proper pressure is reached.
- Monitor the gauge to avoid overcharging.

4. Inspect and Replace AC Compressor (if necessary)

If the compressor is not engaging, locate it and inspect the electrical connections.
If damaged, remove the AC compressor by following these sub-steps:
- Disconnect electrical connectors to the compressor.
- Remove the serpentine belt by using a belt tensioner tool.
- Unscrew the mounting bolts securing the compressor and remove it from the system.
Install the new AC compressor by reversing the removal steps. Ensure all bolts are torqued to the manufacturer's specifications.

5. Reconnect Battery and Test

Reconnect the negative terminal of the battery.
Start the vehicle and activate the AC to check for cold airflow.
Monitor the system for any unusual sounds or leaks.