Volkswagen Golf Seventh Generation (2013-2020) AC not blowing cold air, how to repair?

Volkswagen Golf MK7.5 (2020-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

585 words

Problem Statement

Learn how to diagnose and repair AC not blowing cold air in Volkswagen Golf (2013-2020). Step-by-step guide with symptoms, tools, and solutions.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always wear safety glasses and gloves when handling refrigerants.
•Ensure the AC system is not under pressure before disconnecting hoses.

Symptoms

•AC system blowing warm air
•Unusual noises from the AC compressor
•AC compressor not engaging
•Poor airflow from the vents
•Moisture or refrigerant leaks under the vehicle
•Dashboard warning lights related to AC system

Diagnostic Steps

1
Inspect the AC system for any visible signs of leaks or damage.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Verify the AC compressor operation by checking if it engages when the AC is turned on.
4
Measure the refrigerant pressure using a manifold gauge set.
5
Check the condition and level of the AC refrigerant.
6
Inspect the AC blower motor and related electrical connections for proper function.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Manifold gauge set
•Socket set
•Torque wrench
•Safety glasses
•Gloves
•Vacuum pump

Parts Required

•Refrigerant (R-134a)
•AC compressor (if faulty)
•Receiver/drier (if replaced)

Related Faults

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Diagnostic Steps

1
Inspect the AC system for any visible signs of leaks or damage.
2
Use an OBD-II scanner to check for any error codes related to the AC system.
3
Verify the AC compressor operation by checking if it engages when the AC is turned on.
4
Measure the refrigerant pressure using a manifold gauge set.
5
Check the condition and level of the AC refrigerant.
6
Inspect the AC blower motor and related electrical connections for proper function.

Solution

1. Preparation

Tools Required: OBD-II scanner, manifold gauge set, socket set, torque wrench, safety glasses, gloves.
Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Recharge the AC System

Connect Manifold Gauges:
- Attach the high and low-pressure hoses of the manifold gauge set to the respective service ports on the AC system.
Check Refrigerant Levels:
- Read the pressure gauges to determine if the refrigerant is low.
Add Refrigerant:
- If pressure is low, attach the refrigerant canister to the low-pressure side. Open the valve and allow refrigerant to flow into the system until the correct pressure is reached (typically 30-35 psi for low side).
- Monitor the gauge to avoid overcharging.

3. Inspect and Replace AC Components (if needed)

Check AC Compressor:
- If the compressor is not engaging, inspect the wiring and fuses. Replace any damaged fuses.
- If the compressor is faulty, disconnect the AC lines and remove the compressor using a socket set.
- Install a new compressor and torque the mounting bolts to the manufacturer's specifications.
Replace Receiver/Drier:
- If the system was opened, replace the receiver/drier as well to prevent moisture contamination.
- Ensure all connections are tight and secure.

4. Finalize the Repair

Evacuate and Recharge:
- Use a vacuum pump to evacuate the system for about 30 minutes to remove any moisture.
- Recharge the system with the correct amount of refrigerant according to the manufacturer's specifications (typically around 1.5-2.0 lbs for the Golf).
Reconnect Battery:
- Reconnect the negative terminal of the battery.