my BMW 5 Series F10/F11 (2010-2017) has an AC that blows warm air

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle battery to ensure safety while working on electrical components.

2. Recharge the AC System

• Tools Required: Manifold gauge set, refrigerant canister, AC vacuum pump.
• Attach the manifold gauge set to the low and high-pressure ports of the AC system.
• If low pressure is detected, use the vacuum pump to evacuate the system for about 15-30 minutes to remove moisture and air.
• Recharge the system with the appropriate refrigerant (R-134a or R-1234yf depending on the model) as per the manufacturer's specifications.

3. Replace AC Compressor (if necessary)

• Tools Required: Socket set, torque wrench, AC compressor removal tool.
• Remove the drive belt by loosening the tensioner.
• Disconnect the electrical connector and refrigerant lines from the AC compressor.
• Remove the compressor mounting bolts and carefully take out the compressor.
• Install the new compressor by reversing the removal steps, ensuring all connections are secure and properly torqued.

4. Check and Replace Cabin Air Filter

• Tools Required: None specifically, but a flathead screwdriver may be useful.
• Locate the cabin air filter compartment, usually behind the glove box.
• Remove the cover and take out the old filter.
• Install a new cabin air filter, ensuring it is oriented correctly for airflow direction.

5. Testing the System

• Reconnect the vehicle battery.
• Start the engine and turn on the AC to the maximum setting.
• Monitor the air temperature from the vents to ensure it is cold.