why does my Volkswagen Golf MK7 (2015-2019) AC blow warm air instead of cold?

Solution

1. Preparation

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

2. Check Refrigerant Levels

• Tools Required: AC manifold gauge set
• Instructions:
  1. Connect the low-pressure side gauge to the service port.
  2. Read the pressure; it should be within the manufacturer's specified range (typically around 30-40 PSI).
  3. If low, proceed to recharge the system.

3. Recharge AC System

• Parts Required: R-134a refrigerant
• Instructions:
  1. Attach the refrigerant can to the manifold gauge.
  2. Open the valve to allow refrigerant to flow into the system.
  3. Monitor the pressure until it reaches the appropriate level.
  4. Close the valve and disconnect the gauge set.

4. Inspect and Replace AC Components

• Tools Required: Socket set, torque wrench
• Instructions:
  1. If the compressor is not engaging, check the electrical connections and fuses.
  2. If the compressor is faulty, remove it by unbolting and disconnecting the lines.
  3. Replace it with a new compressor and secure all connections.
  4. Refill the system with oil as specified by the manufacturer.

5. Check and Clean the Condenser

• Instructions:
  1. Locate the AC condenser in front of the radiator.
  2. Inspect for debris or blockages; clean with compressed air or water.
  3. Ensure that the fins are not bent or damaged.

6. Reassemble and Test

• Reconnect the battery.
• Start the vehicle and turn on the AC to check for proper operation and cold air blowing from the vents.