Volkswagen Golf Seventh Generation (2013-2020) AC blows hot air how to fix it

Volkswagen Golf Eighth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

586 words

Problem Statement

Learn how to diagnose and fix AC blowing hot air in Volkswagen Golf (2013-2020). 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.
•Follow proper procedures for handling refrigerants, as they can be hazardous to health.
•Allow the engine to cool before working on the AC components.

Symptoms

•AC compressor not engaging
•Warm air from vents regardless of temperature setting
•Unusual noises from the AC compressor
•Smell of refrigerant inside the cabin
•AC system cycles on and off frequently

Diagnostic Steps

1
Scan the vehicle's computer with an OBD-II scanner to check for any error codes related to the AC system.
2
Inspect the AC refrigerant levels using a manifold gauge set to ensure they are within manufacturer specifications.
3
Visual inspection of the AC compressor for any signs of damage or leakage.
4
Check for proper operation of the AC clutch by testing voltage at the compressor connector.
5
Inspect the cabin air filter for clogs that could restrict airflow.
6
Verify the functionality of the AC control module and associated fuses.

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
•Manifold gauge set
•Multimeter
•Socket set
•Screwdrivers
•AC refrigerant
•Vacuum pump

Parts Required

•AC compressor (if faulty)
•Cabin air filter
•AC refrigerant

Related Faults

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Diagnostic Steps

1
Scan the vehicle's computer with an OBD-II scanner to check for any error codes related to the AC system.
2
Inspect the AC refrigerant levels using a manifold gauge set to ensure they are within manufacturer specifications.
3
Visual inspection of the AC compressor for any signs of damage or leakage.
4
Check for proper operation of the AC clutch by testing voltage at the compressor connector.
5
Inspect the cabin air filter for clogs that could restrict airflow.
6
Verify the functionality of the AC control module and associated fuses.

Solution

1. Preparation

Tools Needed: OBD-II scanner, manifold gauge set, multimeter, socket set, screwdrivers, AC refrigerant, vacuum pump
Disconnect the vehicle's battery to ensure safety during repairs.

2. Recharge the AC System

Sub-steps:
1. Connect the manifold gauge set to the high and low-pressure ports of the AC system.
2. Check the pressure readings. If low, proceed to recharge.
3. Vacuum the system using a vacuum pump for at least 30 minutes to remove moisture and air.
4. Introduce the correct type and amount of refrigerant (typically R-134A for this model) as specified in the vehicle’s service manual.

3. Replace AC Compressor (if faulty)

Sub-steps:
1. Remove the serpentine belt by loosening the tensioner.
2. Unbolt and disconnect the AC compressor from its mounting.
3. Disconnect the refrigerant lines (ensure the system is depressurized).
4. Install the new compressor and reconnect the refrigerant lines, torquing to specifications.
5. Reinstall the serpentine belt and reconnect the battery.

4. Inspect and Replace Cabin Air Filter (if clogged)

Sub-steps:
1. Locate the cabin air filter housing, usually behind the glove box.
2. Remove the glove box if necessary to access the filter.
3. Take out the old filter and clean the housing.
4. Install the new cabin air filter, ensuring it is oriented correctly.

5. Testing and Final Checks

Sub-steps:
1. Start the vehicle and turn on the AC to the maximum setting.
2. Monitor the pressure readings on the manifold gauge to ensure proper function.
3. Check for any unusual noises or leaks.
4. Ensure cold air is coming from the vents.