why does my BMW 5 Series F10/F11 (2010-2017) AC only blow hot air

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, coolant, multimeter, socket set, and refrigerant if recharging is needed.
• Ensure the vehicle is parked on a flat surface and the engine is off for safety.

2. Check and Refill Coolant

• Sub-steps:
  • Open the hood and locate the coolant reservoir.
  • Inspect the coolant level; if low, add the correct type of coolant as per the owner's manual.
  • Start the engine and let it reach operating temperature, monitoring the coolant level for leaks.

3. Inspect and Replace AC Compressor

• Sub-steps:
  • Locate the AC compressor and visually inspect for any damage or leaks.
  • Use a multimeter to check the electrical connections to the compressor.
  • If the compressor is faulty, disconnect the battery, remove the drive belt, and unbolt the compressor from its mounting.
  • Install the new compressor by reversing the removal steps and ensure proper torque specifications are followed.

4. Check and Replace Blend Door Actuator

• Sub-steps:
  • Remove the dashboard panel to access the blend door actuator.
  • Disconnect the actuator's electrical connector and check its resistance with a multimeter; replace if out of specification.
  • Install the new actuator and reassemble the dashboard panel securely.

5. Recharge AC System

• Sub-steps:
  • Connect the refrigerant gauge set to the AC service ports.
  • Evacuate the system using a vacuum pump for at least 30 minutes.
  • Recharge the system with the appropriate type and amount of refrigerant as specified in the owner's manual.