Volkswagen Golf MK7 (2015-2019) AC not blowing cold air, what should I check?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety during repairs.
• Ensure the vehicle is on a flat surface and the engine is cool before starting.

2. Refill Refrigerant

• Tools Required: Manifold gauge set, refrigerant canister, safety goggles, gloves.
• Attach the manifold gauge set to the AC service ports (high and low side).
• Start the engine and turn on the AC to the maximum setting.
• Check the pressure readings on the gauges. If the low side is below 30 psi, the system may require refrigerant.
• If necessary, connect the refrigerant canister and slowly add refrigerant until the correct pressure is achieved (usually around 30-40 psi on the low side).

3. Repair or Replace AC Components (if necessary)

• Tools Required: Socket set, screwdrivers, AC compressor removal tool.
• If the compressor is not engaging, check electrical connections and replace if faulty.
• If leaks are found, replace the leaking component (e.g., compressor, condenser, or hoses).
• Ensure to replace the accumulator/drier and perform a vacuum test before refilling with refrigerant after any component replacement.

4. System Testing

• Tools Required: Multimeter, thermometer.
• After repairs, run the AC system and use a thermometer to check the air temperature at the vents.
• Ensure the system is blowing cold air, typically around 40°F (4°C) or lower.