Volkswagen Passat B8 (2015-2022) AC not blowing cold air, what might be causing it?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the work area is clean and free of debris.
• Disconnect the battery to avoid electrical shorts.

2. Check and Recharge Refrigerant

• Tools Required: Manifold gauge set, vacuum pump, refrigerant (R-134a), safety goggles, gloves.
• Connect the manifold gauge to the AC service ports.
• Sub-steps:
  • With the engine running and the AC on max, check the low and high-pressure readings.
  • If low, use a vacuum pump to evacuate the system for 30 minutes to remove moisture.
  • Recharge the system with the appropriate amount of refrigerant, monitoring pressure levels using the gauge.

3. Inspect and Replace AC Components

• Tools Required: Socket set, torque wrench, screwdrivers, replacement parts (compressor, condenser, etc. if needed).
• Sub-steps:
  • If the compressor is not engaging, check the electrical connections and replace any damaged wires.
  • If the compressor is faulty, remove it by disconnecting the refrigerant lines and electrical connectors.
  • Install the new compressor, ensuring all connections are secure and torqued to manufacturer specifications.

4. Test AC System Functionality

• Sub-steps:
  • Reconnect the battery and start the engine.
  • Set the AC to maximum and observe the operation of the compressor and airflow.
  • Monitor the temperature of the air coming from the vents to ensure it is cold.