my Volkswagen Golf MK7 (2015-2019) AC is blowing warm air, what should I do?

Volkswagen Golf MK8.5 (2024-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

534 words

Problem Statement

Complete guide to fixing AC that blows warm air in Volkswagen Golf MK7 (2015-2019). Includes symptoms, diagnostic steps, tools required, and repair procedures.

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 inspecting or working on the AC system.

Symptoms

•AC blows warm air instead of cold
•AC compressor does not engage
•Unusual noises from the AC compressor
•Foggy or dirty air from the vents
•Decreased airflow from the vents

Diagnostic Steps

1
Check the AC settings to ensure the system is set to 'Max AC' and the temperature is set to the lowest setting.
2
Inspect the AC refrigerant level using a pressure gauge.
3
Listen for the AC compressor engagement when the AC is turned on.
4
Check for any visible leaks or damage in the AC lines and components.
5
Scan the vehicle's computer system for any error codes related to the AC system.

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

•AC refrigerant gauge
•Refrigerant can
•Hose
•Socket set
•Torque wrench
•AC compressor removal tool
•Screwdriver set
•Flashlight

Parts Required

•AC refrigerant
•AC compressor (if needed)
•O-rings and seals (if replacing components)

Related Faults

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Diagnostic Steps

1
Check the AC settings to ensure the system is set to 'Max AC' and the temperature is set to the lowest setting.
2
Inspect the AC refrigerant level using a pressure gauge.
3
Listen for the AC compressor engagement when the AC is turned on.
4
Check for any visible leaks or damage in the AC lines and components.
5
Scan the vehicle's computer system for any error codes related to the AC system.

Solution

1. Preparation

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

2. Check and Recharge Refrigerant

Tools Required: AC refrigerant gauge, refrigerant can, hose.
Connect the refrigerant gauge to the low-pressure service port.
Check the pressure readings; if low, proceed to recharge.
Sub-steps:
1. Attach the refrigerant can to the gauge.
2. Open the valve on the can and allow refrigerant to flow until the pressure reaches the recommended level.
3. Disconnect the gauge and securely close the service port.

3. Inspect and Replace AC Compressor (if necessary)

Tools Required: Socket set, torque wrench, AC compressor removal tool.
Remove the serpentine belt from the AC compressor.
Sub-steps:
1. Disconnect electrical connectors from the AC compressor.
2. Unbolt the AC compressor from its mounting bracket.
3. Remove the compressor from the vehicle.
4. Install the new AC compressor, ensuring proper alignment.
5. Reconnect electrical connectors and the serpentine belt.

4. Check AC Condenser and Evaporator

Tools Required: Screwdriver set, flashlight.
Visually inspect the AC condenser for blockages or debris.
Sub-steps:
1. Clean any debris from the condenser using compressed air.
2. Inspect the evaporator for signs of leaks or blockages.
3. If the evaporator is blocked, consult a service manual for removal and cleaning procedures.