my Volkswagen Golf MK7.5 (2020-Present) air conditioning is blowing warm air

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is turned off.
• Disconnect the negative battery terminal to ensure safety while working.

2. Check and Recharge Refrigerant

• Tools Required: Manifold gauge set, refrigerant (R-134a or R-1234yf as applicable), safety glasses, gloves.
• Sub-steps:
  1. Connect the manifold gauge set to the A/C service ports (high and low side).
  2. Check the pressure readings; if low, proceed to recharge.
  3. Add refrigerant until the system reaches the manufacturer's specified pressure.
  4. Monitor the gauges during the recharging process to avoid overcharging.

3. Inspect and Replace A/C Compressor (if necessary)

• Tools Required: Socket set, wrenches, A/C compressor replacement kit, torque wrench.
• Sub-steps:
  1. If the compressor is not engaging, disconnect the electrical connector and check for power using a multimeter.
  2. If power is present and the compressor is not functioning, remove the compressor by:
     • Detaching the refrigerant lines (be cautious of residual refrigerant).
     • Unbolting the compressor from its mounting brackets.
  3. Install the new compressor, ensuring proper alignment and torque specifications are followed.
  4. Reconnect refrigerant lines and electrical connectors.

4. Replace Cabin Air Filter

• Tools Required: None required, but a flathead screwdriver may be useful.
• Sub-steps:
  1. Locate the cabin air filter compartment (usually behind the glove box).
  2. Remove the cover and take out the old filter.
  3. Install the new filter in the correct orientation as indicated in the compartment.

5. Reconnect Battery and Test A/C

• Sub-steps:
  1. Reconnect the negative battery terminal.
  2. Start the vehicle and turn on the A/C to the maximum cooling setting.
  3. Monitor the temperature of the air coming from the vents to ensure it is cooling properly.