how to fix the AC not cooling in 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

623 words

Problem Statement

Learn how to diagnose and fix AC not cooling 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 components
•Allow the engine to cool before performing any repairs on the AC system

Symptoms

•AC system blows warm air
•AC compressor not engaging
•Strange noises from the AC system
•Foul odor from the vents
•Increased humidity inside the vehicle
•AC system cycling on and off frequently

Diagnostic Steps

1
Check AC controls to ensure temperature settings are correctly set to cold and the AC is turned on
2
Inspect for refrigerant leaks around hoses, connections, and the compressor
3
Scan for error codes using an OBD-II scanner
4
Test AC compressor operation by listening for engagement when the AC is turned on
5
Examine electrical connections for any damage or corrosion
6
Check cabin air filter to ensure it is clean and not obstructing airflow

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 set
•Multimeter
•Socket set
•Torque wrench
•Screwdriver set

Parts Required

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

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Diagnostic Steps

1
Check AC controls to ensure temperature settings are correctly set to cold and the AC is turned on
2
Inspect for refrigerant leaks around hoses, connections, and the compressor
3
Scan for error codes using an OBD-II scanner
4
Test AC compressor operation by listening for engagement when the AC is turned on
5
Examine electrical connections for any damage or corrosion
6
Check cabin air filter to ensure it is clean and not obstructing airflow

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is turned off.
Disconnect the vehicle battery to ensure safety while working on electrical components.

Tools Required:

OBD-II scanner
Refrigerant gauge set
Multimeter
Socket set
Torque wrench
Screwdriver set

2. Recharge Refrigerant

Locate the low-pressure service port: This is usually located near the AC compressor.
Connect the refrigerant gauge: Attach the low-pressure gauge to the service port.
Check refrigerant level: If the reading is low, proceed to recharge.
Add refrigerant: Follow the manufacturer's specifications for the type and amount of refrigerant (typically R-134a).
Monitor pressure: Ensure the pressure is within the acceptable range as indicated on the gauge.

3. Replace AC Compressor (if necessary)

Remove the drive belt: Use a wrench to relieve tension on the serpentine belt and remove it.
Disconnect electrical connectors: Carefully unplug the connectors from the AC compressor.
Remove mounting bolts: Use a socket set to remove bolts securing the compressor to the engine block.
Replace compressor: Install the new compressor by securing it with mounting bolts and reconnecting electrical connectors.
Reinstall the drive belt: Ensure the belt is properly routed and tensioned.

4. Clean or Replace Cabin Air Filter

Access the cabin air filter: Usually located behind the glove box or under the dashboard.
Remove the old filter: Take out the existing filter and inspect it for dirt and debris.
Install new filter: Place a new, clean filter in the correct orientation, ensuring a snug fit.