how to fix Volkswagen Golf MK7 (2015-2019) AC compressor not turning on

Volkswagen Golf MK7 (2015-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

535 words

Problem Statement

Learn how to diagnose and fix the AC compressor not turning on in a 2015-2019 Volkswagen Golf MK7. Step-by-step guide with diagnostic procedures 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 glasses and gloves when handling refrigerants and AC components.

Symptoms

•AC compressor not turning on
•Warm air blowing from vents
•AC system making clicking noises when activated
•Check engine light illuminated (potentially)
•Reduced engine performance during AC operation

Diagnostic Steps

1
Scan the vehicle's OBD-II system for any error codes related to the AC system.
2
Check the AC system refrigerant level using a pressure gauge.
3
Inspect the AC compressor clutch for proper engagement and signs of wear.
4
Verify the operation of the AC relay and fuse by checking for continuity.
5
Test the AC control switch for functionality and proper wiring.
6
Inspect the wiring and connectors leading to the AC compressor for damage or corrosion.

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 set
•Vacuum pump
•Socket set
•Screwdriver

Parts Required

•AC relay (if defective)
•R-134a refrigerant
•AC compressor clutch (if defective)

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Diagnostic Steps

1
Scan the vehicle's OBD-II system for any error codes related to the AC system.
2
Check the AC system refrigerant level using a pressure gauge.
3
Inspect the AC compressor clutch for proper engagement and signs of wear.
4
Verify the operation of the AC relay and fuse by checking for continuity.
5
Test the AC control switch for functionality and proper wiring.
6
Inspect the wiring and connectors leading to the AC compressor for damage or corrosion.

Solution

1. Preparation

Gather tools and parts necessary for the repair.
Disconnect the battery to prevent electrical shorts.
Ensure the vehicle is in a well-ventilated area and parked on a flat surface.

2. Check and Replace the AC Relay

Tools Required: Multimeter, socket set, screwdriver
Locate the AC relay in the fuse box (refer to the owner's manual for exact location).
Remove the relay and test it with a multimeter for continuity.
If defective, replace with a new relay of the same specifications.

3. Inspect and Recharge Refrigerant

Tools Required: Refrigerant gauge set, vacuum pump, refrigerant can
Connect the refrigerant gauge set to the low and high-pressure service ports.
Check the pressure readings to determine the refrigerant level.
If low, use a vacuum pump to evacuate the system, then recharge with the correct amount of R-134a refrigerant as specified in the owner’s manual.

4. Inspect and Replace the AC Compressor Clutch

Tools Required: Socket set, wrench set, puller tool
Remove the AC compressor from the vehicle by unscrewing the mounting bolts.
Inspect the compressor clutch for wear or damage. If defective, replace the clutch assembly.
Reinstall the compressor, ensuring proper torque specifications for the mounting bolts.

5. Reconnect Battery and Test

Reconnect the battery terminals.
Start the vehicle and turn the AC system on to check if the compressor engages.