how to fix the AC not working in my Volkswagen Golf MK7.5 (2020-Present)

Volkswagen Golf MK7.5 (2020-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

607 words

Problem Statement

Learn how to diagnose and fix AC not working in Volkswagen Golf MK7.5. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Wear safety goggles and gloves when handling refrigerants and AC components.

Symptoms

•AC system not blowing cold air
•AC compressor not engaging
•Unusual noises from the AC system
•Foul odor from the vents
•AC warning light illuminated on the dashboard
•Reduced airflow from the vents

Diagnostic Steps

1
Check the AC system's refrigerant level using a refrigerant gauge.
2
Scan for error codes using an OBD-II scanner specifically related to the AC system.
3
Inspect the AC compressor and ensure it is engaging when the AC is turned on.
4
Examine electrical connections and fuses related to the AC system for any damage or corrosion.
5
Inspect the cabin air filter for clogs or blockages.
6
Check for any visible leaks in the AC system components.

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
•Refrigerant gauge
•Socket set
•Torque wrench
•Safety goggles
•Gloves

Parts Required

•R-134a refrigerant
•AC compressor (if needed)
•Cabin air filter

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Diagnostic Steps

1
Check the AC system's refrigerant level using a refrigerant gauge.
2
Scan for error codes using an OBD-II scanner specifically related to the AC system.
3
Inspect the AC compressor and ensure it is engaging when the AC is turned on.
4
Examine electrical connections and fuses related to the AC system for any damage or corrosion.
5
Inspect the cabin air filter for clogs or blockages.
6
Check for any visible leaks in the AC system components.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle battery to ensure safety during repairs.
Ensure the vehicle is parked on a level surface.

2. Recharge Refrigerant

Tools Required: Refrigerant gauge, R-134a refrigerant, safety goggles, gloves.
Locate the low-pressure service port of the AC system.
Attach the refrigerant gauge to the low-pressure port.
If the pressure is low, add R-134a refrigerant according to manufacturer specifications.
Monitor the gauge to avoid overcharging.

3. Inspect and Replace AC Compressor

Tools Required: Socket set, torque wrench, AC compressor replacement part, refrigerant oil.
Locate the AC compressor in the engine bay.
Disconnect the electrical connector and remove the drive belt from the compressor.
Unbolt the compressor from its mount and remove any attached hoses (be prepared for some refrigerant escape).
Install the new compressor by securing it in place and connecting the hoses.
Reconnect the electrical connector and reinstall the drive belt.
Add appropriate refrigerant oil to the new compressor as recommended by the manufacturer.

4. Replace Cabin Air Filter

Tools Required: None (may require a flathead screwdriver for certain models).
Locate the cabin air filter access panel, typically found behind the glove compartment or under the dashboard.
Remove the panel and take out the old cabin air filter.
Install a new cabin air filter, ensuring it is oriented correctly according to airflow direction.
Reattach the access panel.

5. Reconnect Battery and Test

Reconnect the vehicle battery.
Start the car and turn on the AC to the maximum setting.
Monitor for any unusual noises or smells and check if the system is blowing cold air.