Volkswagen Golf MK7.5 (2020-Present) air conditioning stopped working suddenly, why?

Volkswagen Golf MK7.5 (2020-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

630 words

Problem Statement

Learn how to diagnose and fix air conditioning issues 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

•Always wear safety glasses and gloves when handling refrigerants.
•Allow the engine to cool before working on the A/C compressor or any engine components.

Symptoms

•No cold air blowing from the vents
•Air conditioning system making unusual noises (e.g., clicking or grinding)
•Check engine light illuminated (if related to system failure)
•Foul odor coming from the vents when the A/C is turned on
•Reduced airflow from the A/C vents
•A/C compressor not engaging

Diagnostic Steps

1
Inspect the A/C system for visible leaks or damage to hoses and connections.
2
Check the refrigerant level using a pressure gauge.
3
Scan the vehicle's onboard computer for any error codes related to the A/C system.
4
Examine the A/C compressor clutch to see if it is engaging when the A/C is turned on.
5
Inspect the cabin air filter for clogs or restrictions.
6
Test the A/C control module and associated electrical connections for faults.

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 manifold gauge set
•Vacuum pump
•Socket set
•Torque wrench
•Screwdrivers

Parts Required

•Refrigerant (R-134a)
•A/C compressor (if applicable)
•Cabin air filter

Related Faults

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Symptoms

•No cold air blowing from the vents

•Air conditioning system making unusual noises (e.g., clicking or grinding)

•Check engine light illuminated (if related to system failure)

•Foul odor coming from the vents when the A/C is turned on

•Reduced airflow from the A/C vents

•A/C compressor not engaging

Diagnostic Steps

1
Inspect the A/C system for visible leaks or damage to hoses and connections.
2
Check the refrigerant level using a pressure gauge.
3
Scan the vehicle's onboard computer for any error codes related to the A/C system.
4
Examine the A/C compressor clutch to see if it is engaging when the A/C is turned on.
5
Inspect the cabin air filter for clogs or restrictions.
6
Test the A/C control module and associated electrical connections for faults.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a flat surface and the engine is off.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Refrigerant Recharge

Connect a refrigerant manifold gauge set to the A/C service port.
Check the high and low-pressure readings on the gauge to assess refrigerant levels.
If low, evacuate the system using a vacuum pump for at least 30 minutes. This removes moisture and contaminants.
Recharge the A/C system with the correct type and amount of refrigerant (usually R-134a for this model).
Monitor pressure readings during charging to ensure correct levels are achieved.

3. A/C Compressor Inspection

Inspect the A/C compressor visually for any signs of damage or leaks.
If the compressor is not engaging, check the electrical connections and fuses related to the A/C system.
If necessary, replace the A/C compressor following these steps:
- Remove the drive belt by loosening the tensioner.
- Disconnect electrical connectors and refrigerant lines from the compressor.
- Unbolt the compressor from its mounting bracket and remove it.
- Install the new compressor and reverse the disassembly steps.

4. Cabin Air Filter Replacement

Locate the cabin air filter housing, usually behind the glove compartment.
Remove the glove compartment for access if necessary.
Take out the old cabin air filter and inspect it for dirt and debris.
Insert a new cabin air filter, ensuring it is oriented correctly.

5. Final Checks

Reconnect the negative battery terminal.
Start the engine and turn on the A/C to test functionality.
Check for any unusual noises and monitor airflow from the vents.