why does my Volkswagen Golf A/C blow warm air when car is running

Solution

1. Preparation

• Tools Required: Safety goggles, gloves, refrigerant manifold gauge set, torque wrench, basic hand tools.
• Ensure the vehicle is parked on a level surface and the engine is off. Wear safety goggles and gloves throughout the repair process.

2. Recover and Evacuate Refrigerant

• Sub-steps:
  1. Connect the manifold gauge set to the A/C service ports (high and low side).
  2. Start the engine and turn on the A/C to the maximum setting.
  3. Use the recovery machine to recover the existing refrigerant from the system, ensuring compliance with local environmental regulations.
  4. Once recovered, evacuate the system for at least 30 minutes to remove moisture.

3. Inspect and Replace Components

• Sub-steps:
  1. Check the A/C compressor for proper operation; if it fails to engage, consider replacing it.
  2. Inspect the A/C condenser for blockages or damage; replace if necessary.
  3. Replace the accumulator/drier if moisture is suspected or if replaced components were installed.
  4. Replace the cabin air filter if dirty or clogged.

4. Recharge A/C System

• Sub-steps:
  1. Using the manifold gauge set, weigh the correct amount of refrigerant (R-134a or R-1234yf, depending on the model year) and charge the A/C system.
  2. Follow manufacturer specifications for refrigerant amount (typically around 1.5 to 2.0 lbs for most models).
  3. Start the engine and monitor the pressures on the gauge set, ensuring they fall within the normal operating range.

5. Test Operation

• Sub-steps:
  1. With the A/C system running, check the temperature at the vents with a thermometer; it should be significantly cooler than outside air.
  2. Ensure the A/C compressor cycles correctly and does not exhibit abnormal noises.