how to fix the AC in my Volkswagen Golf MK7.5 (2020-Present) that won’t turn on

Volkswagen Golf MK7.5 (2020-Present)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

591 words

Problem Statement

Learn how to diagnose and fix AC that won't turn on in Volkswagen Golf MK7.5. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

HVAC

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow the engine to cool before inspecting or working on the AC system.

Symptoms

•AC system does not respond when activated
•No airflow from the vents
•No unusual sounds from the AC compressor
•AC indicator light does not illuminate
•Possible foul odor from vents when attempting to turn on AC

Diagnostic Steps

1
Check the AC control settings to ensure the system is properly set to 'On.'
2
Inspect the fuse related to the AC system in the fuse box for any signs of damage or failure.
3
Scan the vehicle's computer using an OBD-II scanner for any related error codes that may indicate a malfunction.
4
Verify the refrigerant level in the AC system using a refrigerant gauge to check for proper charge.
5
Inspect the AC compressor visually for any signs of damage or leaks.
6
Test the AC relay to ensure it is functioning correctly.

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
•Multimeter
•Refrigerant gauge
•Socket set
•Needle-nose pliers
•Fuse puller

Parts Required

•AC fuse (if blown)
•AC relay (if faulty)
•Refrigerant (if low)

Related Faults

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Diagnostic Steps

1
Check the AC control settings to ensure the system is properly set to 'On.'
2
Inspect the fuse related to the AC system in the fuse box for any signs of damage or failure.
3
Scan the vehicle's computer using an OBD-II scanner for any related error codes that may indicate a malfunction.
4
Verify the refrigerant level in the AC system using a refrigerant gauge to check for proper charge.
5
Inspect the AC compressor visually for any signs of damage or leaks.
6
Test the AC relay to ensure it is functioning correctly.

Solution

1. Preparation

Gather necessary tools and safety equipment.
Ensure the vehicle is parked on a flat surface and the engine is off.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Check and Replace Fuse

Tools Required: Fuse puller or needle-nose pliers.
Locate the fuse box (typically under the dashboard or in the engine compartment).
Identify the AC fuse using the diagram on the fuse box cover.
Remove the fuse and inspect it; if the filament is broken, replace it with a new fuse of the same amperage.

3. Inspect and Replace AC Relay

Tools Required: Multimeter.
Locate the AC relay in the fuse box or relay panel (consult the owner’s manual for exact location).
Use a multimeter to test the relay for continuity; if it fails, replace it with a new relay.

4. Recharge the AC System

Tools Required: Refrigerant gauge, refrigerant can.
Connect the refrigerant gauge to the low-pressure service port.
Check the pressure; if low, follow the instructions on the refrigerant can to recharge the system safely.
Monitor the pressure until it reaches the manufacturer-recommended level.

5. Inspect AC Compressor and Electrical Connections

Tools Required: Socket set, visual inspection tools.
Visually inspect the AC compressor for damage or leaks.
Check electrical connections leading to the compressor for any signs of corrosion or disconnection.
If the compressor is damaged, it may need to be replaced.