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

Volkswagen Golf MK7.5 (2020-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

593 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 components.
•Always wear safety goggles and gloves when handling refrigerants.

Symptoms

•AC not blowing cold air
•Unusual noises when the AC is turned on
•AC compressor not engaging
•Bad odor from the AC vents
•AC control panel lights malfunctioning

Diagnostic Steps

1
Check the AC system for any visible leaks or damage.
2
Use an OBD-II scanner to check for any fault codes related to the climate control system.
3
Inspect the AC refrigerant level using a manifold gauge set.
4
Verify the operation of the AC compressor by listening for engagement sounds.
5
Check the cabin air filter for clogs or contamination.
6
Test the AC control switches 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

•Wrench set
•OBD-II scanner
•Manifold gauge set
•Vacuum pump

Parts Required

•Refrigerant (R-134a or R-1234yf, depending on the system)
•AC compressor (if found faulty)
•Cabin air filter

Related Faults

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Diagnostic Steps

1
Check the AC system for any visible leaks or damage.
2
Use an OBD-II scanner to check for any fault codes related to the climate control system.
3
Inspect the AC refrigerant level using a manifold gauge set.
4
Verify the operation of the AC compressor by listening for engagement sounds.
5
Check the cabin air filter for clogs or contamination.
6
Test the AC control switches for proper function.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the vehicle battery to ensure safety during electrical work.
Tools Required: Wrench set, OBD-II scanner, manifold gauge set, vacuum pump, refrigerant.

2. Refrigerant Refill

Check Refrigerant Level:
- Connect the high and low pressure gauges of the manifold gauge set to the AC system service ports.
- Read the pressure levels; if low, proceed to refill.
Vacuum the System:
- Connect a vacuum pump to the manifold gauges.
- Run the pump for at least 30 minutes to remove moisture and air from the system.
Recharge the AC System:
- Disconnect the vacuum pump and connect the refrigerant canister to the low-pressure service port.
- Open the valve on the canister and let the refrigerant flow into the system until it reaches the manufacturer-recommended level, typically around 1.5-2.0 lbs.

3. AC Compressor Inspection and Repair

Inspect the AC Compressor:
- Check the compressor for signs of damage or leaks.
- If the compressor is not engaging, check the electrical connections and relay.
Replace AC Compressor (if faulty):
- Remove the drive belt by releasing tension from the tensioner.
- Disconnect the electrical connector and refrigerant lines from the compressor.
- Remove the mounting bolts and take out the old compressor.
- Install the new compressor, ensuring all connections are tight and secure.
- Reattach the drive belt and check for proper alignment.

4. Cabin Air Filter Replacement

Remove the Old Filter:
- Open the glove compartment and remove any screws or clips holding it in place.
- Take out the old cabin air filter.
Install New Filter:
- Insert the new cabin air filter, ensuring it is oriented correctly.
- Reassemble the glove compartment.