why does my Volkswagen Golf MK5 (2004-2008) AC blow warm air?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety while working on the electrical components.

2. Recharging the AC System

• Tools Required: Refrigerant gauge set, refrigerant canister.
• If refrigerant levels are low, attach the low-pressure side of the gauge set to the AC service port.
• Start the engine and turn the AC to the maximum setting.
• Slowly add refrigerant to the system until the correct pressure is reached as indicated on the gauge.
• Monitor the system for any changes in temperature.

3. Inspecting and Replacing the AC Compressor

• Tools Required: Socket set, torque wrench, AC compressor replacement part.
• If the compressor is not operational, remove the drive belt by loosening the tensioner.
• Remove the bolts securing the AC compressor, disconnect the electrical connector, and remove the refrigerant lines (ensure to recover refrigerant if still present).
• Install the new compressor, reconnect the refrigerant lines, and electrical connector, ensuring all seals are replaced to prevent leaks.
• Reinstall the drive belt and tension as per manufacturer specifications.

4. Replacing the Cabin Air Filter

• Tools Required: Flathead screwdriver (if needed).
• Locate the cabin air filter housing, typically behind the glove box.
• Remove the glove box if necessary and take out the old filter.
• Install the new cabin air filter ensuring it is oriented correctly according to airflow direction.