how to fix my BMW 3 Series F30/F31 (2012-2019) air conditioning not blowing cold

Solution

1. Preparation

• Gather necessary tools and parts. Make sure the vehicle is parked on a level surface.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Recharge Refrigerant

• Tools Required: Refrigerant gauge set, R134a refrigerant.
• Sub-steps:
  1. Attach the low-pressure side gauge to the service port.
  2. Check the pressure; it should typically be between 30-40 psi (check manufacturer specifications).
  3. If low, connect the refrigerant canister to the low-pressure port.
  4. Add refrigerant slowly while monitoring the gauge until the proper level is reached.
  5. Disconnect the gauge set and recheck for leaks.

3. Replace AC Compressor (if necessary)

• Tools Required: Socket set, torque wrench, AC compressor tool kit, refrigerant recovery machine.
• Sub-steps:
  1. Recover the refrigerant using a recovery machine.
  2. Remove the serpentine belt from the AC compressor.
  3. Disconnect the electrical connector from the compressor.
  4. Unbolt the compressor from the mounting brackets and remove it from the vehicle.
  5. Install the new compressor, ensuring all bolts are torqued to manufacturer specifications.
  6. Reconnect the electrical connector and reinstall the serpentine belt.

4. Clear any Fault Codes

• After repairs, use the OBD-II scanner to clear any stored fault codes from the HVAC system.

5. Reconnect Battery

• Reconnect the negative battery terminal and ensure all connections are secure.