my BMW 5 Series F10/F11 (2010-2017) AC is not blowing cold air what to check

Solution

1. Preparation

• Gather tools: OBD-II scanner, manifold gauge set, refrigerant, basic hand tools (screwdrivers, wrenches), safety glasses, gloves.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Check and Recharge Refrigerant

1. Connect Manifold Gauges
   • Attach the low-pressure gauge to the low-pressure service port and the high-pressure gauge to the high-pressure service port.
   • Start the engine and turn on the AC to the maximum setting.
2. Read Pressures
   • Observe the pressure readings. Low pressure below 30 PSI indicates low refrigerant.
   • If low, proceed to recharge the system.
3. Recharge AC System
   • Follow the refrigerant manufacturer's instructions to add refrigerant (R134a or R1234yf as applicable).
   • Monitor the pressure gauge during charging; stop when the correct pressure is reached (typically around 30-40 PSI on low side).
4. Check for Leaks
   • After recharging, apply UV dye to the system and use a UV light to check for leaks around hoses, joints, and the compressor.

3. Inspect and Replace Components

1. Inspect the AC Compressor
   • If the compressor does not engage, check the electrical connections and fuses. Replace any blown fuses.
   • If the compressor is faulty, replace it.
2. Replace Cabin Air Filter
   • Access the cabin air filter location, typically behind the glove box.
   • Remove the old filter and replace it with a new one.