how to fix the air conditioning not blowing cold in my Volkswagen Passat B8 (2015-2022)

Solution

1. Preparation

• Tools Required:
  • OBD-II scanner
  • Refrigerant pressure gauge
  • Socket set
  • Multimeter
• Disconnect the battery to ensure safety while working on electrical components.

2. Check Refrigerant Level

• Connect the refrigerant pressure gauge to the low-pressure service port.
• Read the pressure and compare it to the manufacturer's specifications (typically around 30-40 psi for R-134a).
• If low, proceed to recharge the system.

3. Recharge the AC System

• Obtain the correct refrigerant (R-134a).
• Connect the recharge kit to the low-pressure port and follow the instructions to add refrigerant.
• Monitor the pressure using the gauge to ensure it reaches the appropriate level.

4. Inspect and Replace the AC Compressor (if necessary)

• Remove the serpentine belt by loosening the tensioner with a socket wrench.
• Disconnect electrical connectors from the compressor.
• Remove the bolts securing the compressor to the engine.
• Install the new compressor by reversing the removal steps, ensuring proper torque specifications (usually around 18 ft-lbs).
• Reconnect the belt and electrical connectors.

5. Check and Replace Cabin Air Filter

• Locate the cabin air filter housing (usually behind the glove compartment).
• Remove the glove compartment to access the filter.
• Take out the old filter and install a new one, ensuring it is oriented correctly.