Volkswagen Passat B8 (2015-2022) air conditioning not blowing cold air what could be the issue

Solution

1. Preparation

• Gather necessary tools and replacement parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to avoid electrical hazards.

2. Recharge Refrigerant

• Tools Required: Manifold gauge set, refrigerant canister (R-134a or specified type).
• Attach the low-pressure side of the manifold gauge to the low-pressure service port.
• Start the engine and turn on the AC to the maximum setting.
• Check the reading on the gauge; if low, add refrigerant according to the manufacturer's specifications.
• Monitor the system and ensure it reaches the proper pressure range.

3. Replace Cabin Air Filter

• Tools Required: Screwdriver set.
• Locate the cabin air filter compartment, usually behind the glove box.
• Remove the screws or clips securing the compartment cover.
• Take out the old cabin air filter and replace it with a new one, ensuring the airflow direction matches the indicated arrows.
• Reassemble the cover and secure it with screws or clips.

4. Inspect and Replace AC Compressor (if necessary)

• Tools Required: Socket set, wrench set, and torque wrench.
• Disconnect the battery and remove the serpentine belt from the AC compressor.
• Unplug the electrical connector from the AC compressor.
• Remove the bolts securing the compressor to the engine block and take out the compressor.
• Install the new compressor and secure it with bolts, torquing them to manufacturer specifications.
• Reconnect the electrical connector and install the serpentine belt.

5. Verify System Functionality

• Recharge the AC system and ensure the refrigerant is at the correct level.
• Start the engine and turn on the AC to test for cold air output.
• Check the compressor operation and listen for any unusual noises.