why does my BMW X3 G01 AC blow warm air when it’s on

Solution

1. Preparation

• Gather tools and parts for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the battery to avoid electrical shock.

2. Refrigerant Recharge

• Sub-steps:
  1. Locate the low-pressure service port on the AC system.
  2. Connect the refrigerant gauge set to the service port.
  3. Check the pressure reading; if low, proceed to recharge.
  4. Attach the refrigerant canister and open the valve slowly to add refrigerant.
  5. Monitor the pressure gauge and avoid overcharging the system (ideal pressure typically between 30-40 psi).
  6. Once charged, disconnect the gauge set and recap the service port.

3. AC Compressor Inspection and Replacement

• Sub-steps:
  1. Reconnect the battery.
  2. Start the engine and turn on the AC to check if the compressor engages.
  3. If the compressor does not engage, inspect the electrical connections and fuses related to the AC system.
  4. If the compressor is faulty, remove the serpentine belt using a socket wrench.
  5. Unbolt the AC compressor from its mounting points and disconnect the refrigerant lines (ensure to capture any refrigerant).
  6. Install the new compressor by reversing the removal steps, ensuring all connections are secure and torqued to specifications.

4. Leak Testing

• Sub-steps:
  1. After installation, perform a vacuum test on the system to check for leaks using a vacuum pump.
  2. Hold the vacuum for at least 30 minutes and ensure it holds steady.
  3. If no leaks are detected, proceed to refill the system with refrigerant.