why does my Tesla Model 3 Highland (2024-present) AC blow warm air instead of cold?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the vehicle's 12V battery as a safety precaution.

2. Inspect and Repair AC Components

• AC Compressor:

  • Locate the AC compressor. Check the electrical connections and fuses related to the compressor.
  • If the compressor is faulty, replace it:
    1. Remove the serpentine belt by loosening the tensioner.
    2. Disconnect the AC lines and electrical connectors.
    3. Unbolt the compressor from its mount and remove it.
    4. Install the new compressor, ensuring all connections are secure.

• Refrigerant Recharge:

  • If refrigerant levels are low:
    1. Recover any existing refrigerant using a recovery machine.
    2. Replace the receiver/drier if necessary (if moisture is suspected).
    3. Recharge the system with the appropriate type and amount of refrigerant as specified by the manufacturer (R-134a or R-1234yf).

3. Replace Cabin Air Filter

• If clogged, replace the cabin air filter:
  1. Locate the filter housing, usually behind the glove box.
  2. Remove the glove box and any necessary panels to access the filter.
  3. Remove the old filter and install a new one, making sure it is oriented correctly.

4. Reassemble and Test

• Reconnect all components and ensure everything is secured.
• Reconnect the vehicle's 12V battery.
• Start the vehicle and turn on the AC to the maximum setting.