how do I fix the AC not blowing cold air in my BMW 3 Series G20/G21 (2019-2024)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, refrigerant gauge, basic hand tools (socket set, screwdrivers), leak detection kit.
• Safety Warnings: Disconnect the battery before working on electrical components and allow the engine to cool before starting work on the AC system.

2. Recover Refrigerant

• Use a refrigerant recovery machine to safely remove the existing refrigerant from the system.
• Ensure to follow local environmental regulations regarding refrigerant disposal.

3. Inspect and Repair Components

• AC Compressor:
  • Check the electrical connector; replace if damaged.
  • If the compressor is not engaging, test the relay and fuse. Replace as necessary.
• Condenser:
  • Inspect for blockages or debris; clean thoroughly if needed.
  • Replace the condenser if it is bent or damaged.

4. Recharge AC System

• Using the refrigerant gauge, recharge the AC system with the appropriate type and amount of refrigerant as specified by the manufacturer (R-134a or R-1234yf).
• Monitor the pressure readings to ensure they are within the recommended range.

5. Test System Operation

• Reconnect the battery and start the engine. Turn on the AC to the maximum setting.
• Monitor the AC performance and listen for unusual noises.